diff --git a/data/init.lua b/data/init.lua
index 47892d6..0d4be0d 100644
--- a/data/init.lua
+++ b/data/init.lua
@@ -363,7 +363,7 @@ function OnOpen(path, meta)
 end
 
 Coroutines = {}
-function AddCo(f)
+function CoAdd(f)
     local i = #Coroutines + 1
     Coroutines[i] = coroutine.create(f)
     coroutine.resume(Coroutines[i])
diff --git a/data/test_change_buffer_and_close.project.lua b/data/test_change_buffer_and_close.project.lua
index c45b472..15b81d7 100644
--- a/data/test_change_buffer_and_close.project.lua
+++ b/data/test_change_buffer_and_close.project.lua
@@ -1,6 +1,6 @@
 -- Style.WaitForEvents = 0
 
--- AddCo(function()
+-- CoAdd(function()
 --     Play{
 --         {kind = 10, key = KEY_DOWN, xwindow = 1280, ywindow = 720},
 --         {kind = 10, key = KEY_DOWN, xwindow = 1280, ywindow = 720},
diff --git a/src/text_editor/notes_bindings b/src/backup/notes_bindings
similarity index 100%
rename from src/text_editor/notes_bindings
rename to src/backup/notes_bindings
diff --git a/src/text_editor/notes_processes b/src/backup/notes_processes
similarity index 100%
rename from src/text_editor/notes_processes
rename to src/backup/notes_processes
diff --git a/src/text_editor/notes_windows_paths b/src/backup/notes_windows_paths
similarity index 100%
rename from src/text_editor/notes_windows_paths
rename to src/backup/notes_windows_paths
diff --git a/src/text_editor/todo.txt b/src/backup/todo.txt
similarity index 99%
rename from src/text_editor/todo.txt
rename to src/backup/todo.txt
index b43f3da..2215f52 100644
--- a/src/text_editor/todo.txt
+++ b/src/backup/todo.txt
@@ -14,7 +14,6 @@ Needs to change:
     - How to design popup view (input field)?
     - How to design search view? or search and replace view?
 - Window management, splitting, GC
-- add modified stb_sprintf
 
 Things I like:
 - Basic editing
diff --git a/src/text_editor/unicode_example.txt b/src/backup/unicode_example.txt
similarity index 100%
rename from src/text_editor/unicode_example.txt
rename to src/backup/unicode_example.txt
diff --git a/src/basic/basic_math.h b/src/basic/basic_math.h
index 98bc6c2..ef830cc 100644
--- a/src/basic/basic_math.h
+++ b/src/basic/basic_math.h
@@ -57,4 +57,6 @@ union Color {
         uint8_t a;
     };
     uint32_t value;
-};
\ No newline at end of file
+};
+
+#define PI32 3.14159265359f
diff --git a/src/basic/basic_os.cpp b/src/basic/basic_os.cpp
index a96f125..8e1c930 100644
--- a/src/basic/basic_os.cpp
+++ b/src/basic/basic_os.cpp
@@ -482,7 +482,7 @@ API void Advance(FileIter *it) {
         it->filename          = ToString(it->allocator, (char16_t *)data->cFileName, WideLength((char16_t *)data->cFileName));
         const char *is_dir    = it->is_directory ? "/" : "";
         const char *separator = it->path.data[it->path.len - 1] == '/' ? "" : "/";
-        it->relative_path     = Format(it->allocator, "%.*s%s%.*s%s", FmtString(it->path), separator, FmtString(it->filename), is_dir);
+        it->relative_path     = Format(it->allocator, "%S%s%S%s", it->path, separator, it->filename, is_dir);
         it->absolute_path     = GetAbsolutePath(it->allocator, it->relative_path);
         it->is_valid          = true;
 
@@ -504,7 +504,7 @@ API FileIter IterateFiles(Allocator alo, String path) {
     it.allocator = alo;
     it.path      = path;
 
-    String   modified_path   = Format(it.allocator, "%.*s\\*", FmtString(path));
+    String   modified_path   = Format(it.allocator, "%S\\*", path);
     String16 modified_path16 = ToString16(it.allocator, modified_path);
 
     it.w32         = AllocType(it.allocator, Win32_FileIter);
@@ -672,7 +672,7 @@ static void Win32ReportError(String msg, String cmd) {
     char  *buff    = (char *)lpMsgBuf;
     size_t buffLen = strlen((const char *)buff);
     if (buffLen > 0 && buff[buffLen - 1] == '\n') buff[buffLen - 1] = 0;
-    Error("%.*s: %.*s! %s", FmtString(msg), FmtString(cmd), (char *)lpMsgBuf);
+    Error("%S: %S! %s", msg, cmd, (char *)lpMsgBuf);
 }
 
 static void Win32CloseProcess(Process *process) {
@@ -715,7 +715,7 @@ API Process SpawnProcess(String command_line, String working_dir, String write_s
     Win32Process *p       = (Win32Process *)process.platform;
 
     Scratch scratch;
-    command_line = Format(scratch, "/C %.*s", FmtString(command_line));
+    command_line = Format(scratch, "/C %S", command_line);
 
     p->handle             = INVALID_HANDLE_VALUE;
     p->child_stdout_write = INVALID_HANDLE_VALUE;
@@ -759,6 +759,7 @@ API Process SpawnProcess(String command_line, String working_dir, String write_s
     String16 cmd = ToString16(scratch, command_line);
 
     char *env = NULL;
+    // TODO: FIX ARENA ALLOCATION USING PushSize, Prealloc maybe? Maybe we want a block arena
     if (enviroment.len) {
         Int size = GetSize(enviroment) + enviroment.len + 1;
         env = (char *)PushSize(scratch, size);
diff --git a/src/basic/basic_string.h b/src/basic/basic_string.h
index 702ad67..e5a609b 100644
--- a/src/basic/basic_string.h
+++ b/src/basic/basic_string.h
@@ -83,7 +83,6 @@ API String Copy(Allocator allocator, char *string);
 API void NormalizePathInPlace(String s);
 API String NormalizePath(Allocator allocator, String s);
 
-#define FmtString(string) (int)(string).len, (string).data
 API String FormatV(Allocator allocator, const char *data, va_list args1);
 API String Format(Allocator allocator, const char *data, ...);
 #define STRING_FORMAT(allocator, data, result)       \
diff --git a/src/basic/stb_sprintf.h b/src/basic/stb_sprintf.h
index 29f88b6..cfecb9f 100644
--- a/src/basic/stb_sprintf.h
+++ b/src/basic/stb_sprintf.h
@@ -574,11 +574,6 @@ STBSP__PUBLICDEF int STB_SPRINTF_DECORATE(vsprintfcb)(STBSP_SPRINTFCB *callback,
          char num[STBSP__NUMSZ];
          char lead[8];
          char tail[8];
-         struct stb__string {
-            char *data;
-            int64_t len;
-         } S;
-
          char *s;
          char const *h;
          stbsp__uint32 l, n, cs;
@@ -588,6 +583,11 @@ STBSP__PUBLICDEF int STB_SPRINTF_DECORATE(vsprintfcb)(STBSP_SPRINTFCB *callback,
 #endif
          stbsp__int32 dp;
          char const *sn;
+         struct stb__string {
+            char *data;
+            int64_t len;
+         };
+         struct stb__string S;
 
       case 'S':
          // get the string
@@ -596,7 +596,8 @@ STBSP__PUBLICDEF int STB_SPRINTF_DECORATE(vsprintfcb)(STBSP_SPRINTFCB *callback,
             S.data = (char *)"null";
             S.len = 4;
          }
-         l = (unsigned int)S.len;
+         s = S.data;
+         l = stbsp__strlen_limited(S.data, ((int)S.len >= 0) ? (int)S.len : ~0u);
          lead[0] = 0;
          tail[0] = 0;
          pr = 0;
diff --git a/src/metaprogram/metaprogram.cpp b/src/metaprogram/metaprogram.cpp
index 77aa9f2..064af49 100644
--- a/src/metaprogram/metaprogram.cpp
+++ b/src/metaprogram/metaprogram.cpp
@@ -1,8 +1,7 @@
 #include "basic/basic.h"
 #include "basic/basic.cpp"
 
-int main() {
-    InitScratch();
+void Test() {
     // Basic constructors
     {
         String a = "thing";
@@ -36,26 +35,18 @@ int main() {
         Vec2 b = 2 + a;
     }
 
-
-    printf("hello world\n");
 }
 
+int main() {
+    InitScratch();
 
-// #define BASIC_IMPL
-// #include "basic/basic.h"
-// #include "basic/filesystem.h"
+    Scratch scratch;
+    String data = ReadFile(scratch, "../data/init.lua");
+    Array<String> array = {scratch};
 
-// int main() {
-//     InitScratch();
-
-//     Scratch scratch;
-//     String data = ReadFile(scratch, "../data/init.lua");
-//     Array<String> array = {scratch};
-
-//     Add(&array, String{"String BaseLuaConfig = R\"==(\n"});
-//     Add(&array, data);
-//     Add(&array, String{"\n)==\";\n"});
-//     String result = Merge(scratch, array, "");
-//     WriteFile("../src/text_editor/generated_config.cpp", result);
-
-// }
\ No newline at end of file
+    Add(&array, String{"String BaseLuaConfig = R\"==(\n"});
+    Add(&array, data);
+    Add(&array, String{"\n)==\";\n"});
+    String result = Merge(scratch, array, "");
+    WriteFile("../src/text_editor/generated_config.cpp", result);
+}
\ No newline at end of file
diff --git a/src/render/opengl.cpp b/src/render/opengl.cpp
index 7023b82..49b6f38 100644
--- a/src/render/opengl.cpp
+++ b/src/render/opengl.cpp
@@ -296,36 +296,12 @@ void PushVertex2D(Allocator allocator, VertexList2D *list, Vertex2D *vertices, i
 
 void PushQuad2D(Allocator arena, VertexList2D *list, Rect2 rect, Rect2 tex, Color color, float rotation = 0.f, Vec2 rotation_point = {}) {
     Vertex2D *v = AllocVertex2D(arena, list, 6);
-    v[0]        = {
-        {rect.min.x, rect.max.y},
-        { tex.min.x,  tex.max.y},
-        color
-    };
-    v[1] = {
-        {rect.max.x, rect.max.y},
-        { tex.max.x,  tex.max.y},
-        color
-    };
-    v[2] = {
-        {rect.min.x, rect.min.y},
-        { tex.min.x,  tex.min.y},
-        color
-    };
-    v[3] = {
-        {rect.min.x, rect.min.y},
-        { tex.min.x,  tex.min.y},
-        color
-    };
-    v[4] = {
-        {rect.max.x, rect.max.y},
-        { tex.max.x,  tex.max.y},
-        color
-    };
-    v[5] = {
-        {rect.max.x, rect.min.y},
-        { tex.max.x,  tex.min.y},
-        color
-    };
+    v[0] = { {rect.min.x, rect.max.y}, { tex.min.x,  tex.max.y}, color };
+    v[1] = { {rect.max.x, rect.max.y}, { tex.max.x,  tex.max.y}, color };
+    v[2] = { {rect.min.x, rect.min.y}, { tex.min.x,  tex.min.y}, color };
+    v[3] = { {rect.min.x, rect.min.y}, { tex.min.x,  tex.min.y}, color };
+    v[4] = { {rect.max.x, rect.max.y}, { tex.max.x,  tex.max.y}, color };
+    v[5] = { {rect.max.x, rect.min.y}, { tex.max.x,  tex.min.y}, color };
     if (rotation != 0.f) {
         float s = sinf(rotation);
         float c = cosf(rotation);
@@ -385,7 +361,6 @@ Vec2 DrawString(Font *font, String16 string, Vec2 pos, Color color, bool draw =
     return result;
 }
 
-#define PI32 3.14159265359f
 void DrawCircle(Vec2 pos, float radius, Color color) {
     const int segment_count = 16;
     const int vertex_count  = segment_count * 3;
diff --git a/src/test/tests.cpp b/src/test/tests.cpp
index 3b9dd74..eadf78b 100644
--- a/src/test/tests.cpp
+++ b/src/test/tests.cpp
@@ -26,7 +26,7 @@ void Wait(mco_coro *co) {
 
 void PlayTestOpen(mco_coro *co) {
     // Open file, move a little, then open again and verify the caret didn't move
-    String basic_env_cpp = Format(SysAllocator, "%.*s/basic_env/basic_env.cpp", FmtString(TestDir));
+    String basic_env_cpp = Format(SysAllocator, "%S/basic_env/basic_env.cpp", TestDir);
 
     AddCtrlPress(SDLK_P);
     Add(&EventPlayback, {EVENT_KEY_PRESS, SDLK_UP, 1280, 720});
@@ -69,7 +69,7 @@ void PlayTestOpen(mco_coro *co) {
         buffer_len = main.buffer->len;
     }
 
-    AddText(Format(SysAllocator, "%.*s:20", FmtString(basic_env_cpp)));
+    AddText(Format(SysAllocator, "%S:20", basic_env_cpp));
     AddCtrlPress(SDLK_Q);
     Wait(co);
 
@@ -98,7 +98,7 @@ void PlayTestOpen(mco_coro *co) {
 }
 
 void Test(mco_coro *co) {
-    WorkDir = Format(SysAllocator, "%.*s/basic_env", FmtString(TestDir));
+    WorkDir = Format(SysAllocator, "%S/basic_env", TestDir);
     PlayTestOpen(co);
 
 
@@ -114,5 +114,5 @@ void InitTests() {
         file = ChopLastSlash(file);
         TestDir = file;
     }
-    AddCo(Test);
+    CoAdd(Test);
 }
diff --git a/src/text_editor/commands.cpp b/src/text_editor/commands.cpp
index 96ca0ed..af42ed2 100644
--- a/src/text_editor/commands.cpp
+++ b/src/text_editor/commands.cpp
@@ -204,7 +204,7 @@ void ReportErrorf(const char *fmt, ...) {
     STRING_FORMAT(scratch, fmt, string);
     SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Error!", string.data, NULL);
     View *view = GetView(NullViewID);
-    Command_Appendf(view, "%.*s\n", FmtString(string));
+    Command_Appendf(view, "%S\n", string);
     ActiveWindow = NullWindowID;
 }
 
@@ -212,21 +212,21 @@ void ReportConsolef(const char *fmt, ...) {
     Scratch scratch;
     STRING_FORMAT(scratch, fmt, string);
     View *view = GetView(NullViewID);
-    Command_Appendf(view, "%.*s\n", FmtString(string));
+    Command_Appendf(view, "%S\n", string);
 }
 
 void ReportWarningf(const char *fmt, ...) {
     Scratch scratch;
     STRING_FORMAT(scratch, fmt, string);
     View *null_view = GetView(NullViewID);
-    Command_Appendf(null_view, "%.*s\n", FmtString(string));
+    Command_Appendf(null_view, "%S\n", string);
     ActiveWindow = NullWindowID;
 }
 
 void ReportDebugf(const char *fmt, ...) {
     Scratch scratch;
     STRING_FORMAT(scratch, fmt, string);
-    Command_Appendf(TraceView, "%.*s\n", FmtString(string));
+    Command_Appendf(TraceView, "%S\n", string);
 }
 
 void Command_MoveCursorsByPageSize(Window *window, int direction, bool shift = false) {
@@ -681,7 +681,7 @@ void SaveBuffer(Buffer *buffer) {
         buffer->dirty         = false;
         buffer->garbage       = false;
     } else {
-        ReportWarningf("Failed to save file with name: %.*s", FmtString(buffer->name));
+        ReportWarningf("Failed to save file with name: %S", buffer->name);
     }
 }
 void Command_Save() {
@@ -987,7 +987,7 @@ void New(Window *window, String name = "") {
     String dir  = GetDir(buffer);
     if (name != "") {
         if (!IsAbsolute(name)) {
-            name = Format(scratch, "%.*s/%.*s", FmtString(dir), FmtString(name));
+            name = Format(scratch, "%S/%S", dir, name);
         }
         name = GetAbsolutePath(scratch, name);
     } else {
@@ -1016,7 +1016,7 @@ void NewDir(Window *window, String name = "") {
     String dir  = GetDir(buffer);
     if (name != "") {
         if (!IsAbsolute(name)) {
-            name = Format(scratch, "%.*s/%.*s", FmtString(dir), FmtString(name));
+            name = Format(scratch, "%S/%S", dir, name);
         }
         name = GetAbsolutePath(scratch, name);
     } else {
@@ -1070,7 +1070,7 @@ void ListFilesRecursive(Buffer *buffer, String dir) {
             if (!good) {
                 continue;
             }
-            RawAppendf(buffer, "%-80.*s || %.*s\n", FmtString(it.filename), FmtString(it.absolute_path));
+            RawAppendf(buffer, "%-80S || %S\n", it.filename, it.absolute_path);
         }
     }
 }
@@ -1126,9 +1126,9 @@ BSet Command_Open(Window *window, String path, String meta, bool set_active = tr
         }
         if (IsDir(ores.file_path)) {
             JumpGarbageBuffer(&set, GetUniqueBufferName(ores.file_path, "temp", ".dirlisting"));
-            Command_Appendf(set.view, "..\n", FmtString(ores.file_path));
+            Command_Appendf(set.view, "..\n");
             for (FileIter it = IterateFiles(scratch, ores.file_path); IsValid(it); Advance(&it)) {
-                Command_Appendf(set.view, "%.*s\n", FmtString(it.filename));
+                Command_Appendf(set.view, "%S\n", it.filename);
             }
         } else {
             CheckpointBeforeGoto(set.window);
@@ -1230,7 +1230,7 @@ void Command_ListBuffers() {
     ActiveWindow = main.window->id;
     JumpGarbageBuffer(&main);
     for (Buffer *it = FirstBuffer; it; it = it->next) {
-        RawAppendf(main.buffer, "%-80.*s || %.*s\n", FmtString(SkipToLastSlash(it->name)), FmtString(it->name));
+        RawAppendf(main.buffer, "%-80S || %S\n", SkipToLastSlash(it->name), it->name);
     }
     main.view->fuzzy_search = true;
     main.view->update_scroll = true;
@@ -1248,7 +1248,7 @@ void Command_ListViews() {
     JumpGarbageBuffer(&main);
     for (View *it = FirstView; it; it = it->next) {
         Buffer *buffer = GetBuffer(it->active_buffer);
-        Command_Appendf(main.view, "%d %.*s\n", (int)it->id.id, FmtString(buffer->name));
+        Command_Appendf(main.view, "%d %S\n", (int)it->id.id, buffer->name);
     }
 }
 
diff --git a/src/text_editor/coroutines.cpp b/src/text_editor/coroutines.cpp
index 7e4f2d0..f60ea9b 100644
--- a/src/text_editor/coroutines.cpp
+++ b/src/text_editor/coroutines.cpp
@@ -1,7 +1,7 @@
 typedef void      CoroutineProc(mco_coro *co);
 Array<mco_coro *> ActiveCoroutines;
 
-mco_coro *AddCo(CoroutineProc *proc) {
+mco_coro *CoAdd(CoroutineProc *proc) {
     mco_desc desc = mco_desc_init(proc, 0);
 
     mco_coro  *coro = NULL;
@@ -16,7 +16,7 @@ mco_coro *AddCo(CoroutineProc *proc) {
     return coro;
 }
 
-void UpdateCo(Event *event) {
+void CoUpdate(Event *event) {
     IterRemove(ActiveCoroutines) {
         IterRemovePrepare(ActiveCoroutines);
 
diff --git a/src/text_editor/generated_config.cpp b/src/text_editor/generated_config.cpp
index 5b4f922..ff9e567 100644
--- a/src/text_editor/generated_config.cpp
+++ b/src/text_editor/generated_config.cpp
@@ -364,7 +364,7 @@ function OnOpen(path, meta)
 end
 
 Coroutines = {}
-function AddCo(f)
+function CoAdd(f)
     local i = #Coroutines + 1
     Coroutines[i] = coroutine.create(f)
     coroutine.resume(Coroutines[i])
diff --git a/src/text_editor/lua_api.cpp b/src/text_editor/lua_api.cpp
index e417559..f897f91 100644
--- a/src/text_editor/lua_api.cpp
+++ b/src/text_editor/lua_api.cpp
@@ -4,7 +4,7 @@ int Lua_print(lua_State *L) {
     View *null_view = GetView(NullViewID);
     for (int i = 1; i <= nargs; i += 1) {
         String string = lua_tostring(L, i);
-        Command_Appendf(null_view, "%.*s ", FmtString(string));
+        Command_Appendf(null_view, "%S ", string);
     }
     Command_Appendf(null_view, "\n");
     lua_pop(L, nargs);
@@ -16,7 +16,7 @@ int Lua_Print(lua_State *L) {
     int nargs = lua_gettop(L);
     for (int i = 1; i <= nargs; i += 1) {
         String string = lua_tostring(L, i);
-        Command_Appendf(TraceView, "%.*s ", FmtString(string));
+        Command_Appendf(TraceView, "%S ", string);
     }
     Command_Appendf(TraceView, "\n");
     lua_pop(L, nargs);
@@ -263,7 +263,7 @@ extern String BaseLuaConfig;
 
 void LoadLuaBuffer(Buffer *lua_buffer) {
     if (!lua_buffer) return;
-    ReportConsolef("reloading config: %.*s", FmtString(lua_buffer->name));
+    ReportConsolef("reloading config: %S", lua_buffer->name);
 
     Scratch scratch;
     String  string = AllocCharString(scratch, lua_buffer);
@@ -345,7 +345,7 @@ OnOpenResult CallOnOpen(Allocator allocator, String path, String meta) {
     result.file_path = file_path;
     if (!IsAbsolute(result.file_path)) {
         String dir = Command_GetMainDir();
-        result.file_path = Format(allocator, "%.*s/%.*s", FmtString(dir), FmtString(result.file_path));
+        result.file_path = Format(allocator, "%S/%S", dir, result.file_path);
     }
     if (col_string.len) {
         result.col = strtoll(col_string.data, NULL, 10);
@@ -431,13 +431,13 @@ void InitLuaConfig() {
     Buffer *lua_buffer = NULL;
 
     Scratch scratch;
-    String lua_config_exe = Format(scratch, "%.*s/init.lua", FmtString(GetExeDir(scratch)));
+    String lua_config_exe = Format(scratch, "%S/init.lua", GetExeDir(scratch));
     if (FileExists(lua_config_exe)) {
         lua_buffer = BufferOpenFile(lua_config_exe);
     }
 
     if (lua_buffer == NULL) {
-        String lua_config_remote = Format(scratch, "%.*s/init.lua", FmtString(ConfigDir));
+        String lua_config_remote = Format(scratch, "%S/init.lua", ConfigDir);
 // #if DEBUG_BUILD
 //         // WARNING! Delete config to make sure we are running this code more frequently
 //         SDL_RemovePath(lua_config_remote.data);
@@ -447,7 +447,7 @@ void InitLuaConfig() {
         if (lua_buffer->len == 0) {
             String16 string16 = ToString16(scratch, BaseLuaConfig);
             RawReplaceText(lua_buffer, {}, string16);
-            ReportConsolef("no config at: %.*s - creating config buffer", FmtString(lua_config_remote));
+            ReportConsolef("no config at: %S - creating config buffer", lua_config_remote);
         }
     }
 
diff --git a/src/text_editor/management.cpp b/src/text_editor/management.cpp
index 3f1d2b0..1e464cf 100644
--- a/src/text_editor/management.cpp
+++ b/src/text_editor/management.cpp
@@ -58,7 +58,7 @@ String GetUniqueBufferName(String working_dir, String prepend_name, String exten
     Scratch scratch;
     String buffer_name = {};
     for (int i = 1; i < INT_MAX; i += 1) {
-        buffer_name = Format(scratch, "%.*s/%.*s%d%.*s", FmtString(working_dir), FmtString(prepend_name), i, FmtString(extension));
+        buffer_name = Format(scratch, "%S/%S%d%S", working_dir, prepend_name, i, extension);
         buffer_name = GetAbsolutePath(scratch, buffer_name);
         Buffer *exists = FindBuffer(buffer_name);
         if (!exists && !FileExists(buffer_name)) {
@@ -428,7 +428,7 @@ Buffer *BufferOpenFile(String path) {
     if (!FileExists(path)) {
         buffer = CreateBuffer(sys_allocator, path);
     } else if (IsDir(path)) {
-        ReportWarningf("failed to open, it's a directory: %.*s", FmtString(path));
+        ReportWarningf("failed to open, it's a directory: %S", path);
         return GetBuffer(NullBufferID);
     } else {
         String string         = ReadFile(scratch, path);
diff --git a/src/text_editor/process.cpp b/src/text_editor/process.cpp
index 29756da..6ad10f0 100644
--- a/src/text_editor/process.cpp
+++ b/src/text_editor/process.cpp
@@ -1,8 +1,4 @@
 Array<Process> ActiveProcesses = {};
-// @todo: I think I need to push strings onto the arena with alignment zero
-// they should be of format a\0b\0c\0\0. Then it will probably work. It doesn'
-// make a good api so it will have to be done in 2 steps. Platform dependent one
-// and platform independent one
 Array<String> Enviroment = {};
 
 // WARNING: seems that this maybe can't work reliably?
@@ -30,7 +26,7 @@ void UpdateProcesses() {
 
 void Exec(ViewID view, bool scroll_to_end, String cmd, String working_dir) {
     Process process       = SpawnProcess(cmd, working_dir, {}, Enviroment);
-    ReportDebugf("process %lld start. is_valid = %d cmd = %.*s working_dir = %.*s", process.id, process.is_valid, FmtString(cmd), FmtString(working_dir));
+    ReportDebugf("process %lld start. is_valid = %d cmd = %S working_dir = %S", process.id, process.is_valid, cmd, working_dir);
     process.view_id       = view.id;
     process.scroll_to_end = scroll_to_end;
     if (process.is_valid) Add(&ActiveProcesses, process);
@@ -43,7 +39,7 @@ void Exec(ViewID view, bool scroll_to_end, String16 cmd16, String working_dir) {
 }
 
 Buffer *ExecAndWait(Allocator allocator, String cmd, String working_dir, String stdin_string = {}) {
-    ReportDebugf("ExecAndWait cmd = %.*s working_dir = %.*s stdin_string = %.*s", FmtString(cmd), FmtString(working_dir), FmtString(stdin_string));
+    ReportDebugf("ExecAndWait cmd = %S working_dir = %S stdin_string = %S", cmd, working_dir, stdin_string);
 
     Buffer *temp_buffer = CreateTempBuffer(allocator, 4096 * 4);
     for (Process process = SpawnProcess(cmd, working_dir, stdin_string, Enviroment); IsValid(&process);) {
diff --git a/src/text_editor/serializer.cpp b/src/text_editor/serializer.cpp
index db91118..eb1e1fd 100644
--- a/src/text_editor/serializer.cpp
+++ b/src/text_editor/serializer.cpp
@@ -3,7 +3,7 @@ struct Serializer {
 };
 
 void Serialize(Serializer *s, String name, Int *datum) {
-    RawAppendf(s->buffer, "%.*s = %lld, ", FmtString(name), (long long)*datum);
+    RawAppendf(s->buffer, "%S = %lld, ", name, (long long)*datum);
 }
 
 void Serialize(Serializer *s, String name, uint32_t *datum) {
@@ -25,12 +25,12 @@ void Serialize(Serializer *s, String name, int16_t *datum) {
 }
 
 void Serialize(Serializer *s, String name, float *datum) {
-    RawAppendf(s->buffer, "%.*s = %f, ", FmtString(name), *datum);
+    RawAppendf(s->buffer, "%S = %f, ", name, *datum);
 }
 
 void Serialize(Serializer *s, String name, char **text) {
     String str = *text;
-    RawAppendf(s->buffer, "%.*s = \"%.*s\", ", FmtString(name), FmtString(str));
+    RawAppendf(s->buffer, "%S = \"%S\", ", name, str);
 }
 
 void SerializeBegin(Serializer *s) {
diff --git a/src/text_editor/text_editor.cpp b/src/text_editor/text_editor.cpp
index 32c9c4f..b939877 100644
--- a/src/text_editor/text_editor.cpp
+++ b/src/text_editor/text_editor.cpp
@@ -11,7 +11,6 @@
 #include "external/minicoro.h"
 #define LUA_USE_LONGJMP
 #include "external/luaunity.c"
-#include "render/generated_font.cpp"
 
 SDL_Window *SDLWindow;
 bool        IsInFullscreen;
@@ -19,6 +18,7 @@ int         FullScreenSizeX, FullScreenSizeY;
 int         FullScreenPositionX, FullScreenPositionY;
 
 #include "generated_variables.cpp"
+#include "render/generated_font.cpp"
 #include "render/font.cpp"
 #include "render/opengl.cpp"
 
@@ -250,7 +250,7 @@ void Update(Event event) {
         if (it->is_title_bar) ReplaceTitleBarData(it);
     }
     UpdateProcesses();
-    UpdateCo(&event);
+    CoUpdate(&event);
     ReloadLuaConfigs();
     CallLuaOnUpdate(&event);
     UpdateDebugBuffer();
@@ -300,7 +300,7 @@ void Windows_SetupVCVarsall(mco_coro *co) {
         Scratch scratch;
         String working_dir = WorkDir;
         String buffer_name = GetUniqueBufferName(working_dir, "vcvarsall-");
-        String cmd = Format(scratch, "\"%.*s\" && set", FmtString(StyleVCVarsall));
+        String cmd = Format(scratch, "\"%S\" && set", StyleVCVarsall);
         view = Command_ExecHidden(buffer_name, cmd, working_dir);
     }
     for (;;) {
@@ -357,7 +357,7 @@ void MainLoop() {
         View       *view   = GetView(window->active_view);
         Buffer     *buffer = GetBuffer(view->active_buffer);
         const char *dirty  = buffer->dirty ? " !" : "";
-        String      string = Format(scratch, "%.*s%s", FmtString(buffer->name), dirty);
+        String      string = Format(scratch, "%S%s", buffer->name, dirty);
         SDL_SetWindowTitle(SDLWindow, string.data);
     }
 
@@ -498,11 +498,11 @@ int main(int argc, char **argv)
         }
     }
 
-    ReportConsolef("WorkDir = %.*s", FmtString(WorkDir));
+    ReportConsolef("WorkDir = %S", WorkDir);
     InitLuaConfig();
     if (testing) InitTests();
 #if OS_WINDOWS
-    AddCo(Windows_SetupVCVarsall);
+    CoAdd(Windows_SetupVCVarsall);
 #endif
 #if OS_WASM
     emscripten_set_main_loop(MainLoop, 0, 1);
diff --git a/src/text_editor/title_bar.cpp b/src/text_editor/title_bar.cpp
index d031a5f..aa37ed9 100644
--- a/src/text_editor/title_bar.cpp
+++ b/src/text_editor/title_bar.cpp
@@ -19,7 +19,7 @@ void UpdateDebugBuffer() {
     RawAppendf(buffer, "BufferID id = %d\n", main.buffer->id.id);
     RawAppendf(buffer, "Buffer *next = %zu\n", main.buffer->next);
     RawAppendf(buffer, "Buffer *prev = %zu\n", main.buffer->prev);
-    RawAppendf(buffer, "String name = %.*s\n", FmtString(main.buffer->name));
+    RawAppendf(buffer, "String name = %S\n", main.buffer->name);
     RawAppendf(buffer, "Int change_id = %lld\n", (long long)main.buffer->change_id);
     RawAppendf(buffer, "Int user_change_id = %lld\n", (long long)main.buffer->user_change_id);
     RawAppendf(buffer, "Int file_mod_time = %lld\n", (long long)main.buffer->file_mod_time);
@@ -75,7 +75,7 @@ void ReplaceTitleBarData(Window *window) {
             name = GetAbsolutePath(scratch, name);
             if (FindBuffer(name)) {
                 title.window->title_bar_last_buffer_change_id = title.buffer->change_id;
-                ReportConsolef("there is already buffer with name: %.*s", FmtString(name));
+                ReportConsolef("there is already buffer with name: %S", name);
                 return;
             }
 
@@ -115,10 +115,10 @@ void ReplaceTitleBarData(Window *window) {
 
     // replace data up to separator with filename and stuff
     const char *reopen = main.buffer->changed_on_disk ? " Reopen()" : "";
-    String   s                 = Format(scratch, "%.*s:%lld:%lld%s", FmtString(main.buffer->name), (long long)xy.line + 1ll, (long long)xy.col + 1ll, reopen);
+    String   s                 = Format(scratch, "%S:%lld:%lld%s", main.buffer->name, (long long)xy.line + 1ll, (long long)xy.col + 1ll, reopen);
     For (ActiveProcesses) {
         if (it.view_id == main.view->id.id) {
-            s = Format(scratch, "%.*s %lld", FmtString(s), (long long)it.id);
+            s = Format(scratch, "%S %lld", s, (long long)it.id);
         }
     }
 
diff --git a/src/text_editor/window.cpp b/src/text_editor/window.cpp
index 3f52c8e..d794cc5 100644
--- a/src/text_editor/window.cpp
+++ b/src/text_editor/window.cpp
@@ -14,7 +14,7 @@ Window *CreateSearchBar(WindowID parent_window_id) {
 
     static int BarCount;
     Allocator  sys_allocator = GetSystemAllocator();
-    String     name          = Format(sys_allocator, "%.*s/searchbar%d", FmtString(WorkDir), ++BarCount);
+    String     name          = Format(sys_allocator, "%S/searchbar%d", WorkDir, ++BarCount);
 
     Buffer *b           = CreateBuffer(sys_allocator, name);
     View   *v           = CreateView(b->id);
@@ -37,7 +37,7 @@ Window *CreateTitlebar(WindowID parent_window_id) {
 
     static int TitlebarCount;
     Allocator  sys_allocator = GetSystemAllocator();
-    String     name          = Format(sys_allocator, "%.*s/titlebar%d", FmtString(WorkDir), ++TitlebarCount);
+    String     name          = Format(sys_allocator, "%S/titlebar%d", WorkDir, ++TitlebarCount);
 
     Buffer *b           = CreateBuffer(sys_allocator, name);
     View   *v           = CreateView(b->id);