Parsing exprs, enum_decls, Introduce intern table, symbol table

lex.h

@@ -1,4 +1,7 @@
 #pragma once
+typedef struct Intern_String{
+  String s;
+}Intern_String;
 
 typedef enum Token_Kind{
   meta("End of stream")TK_End,
@@ -59,6 +62,7 @@ typedef enum Token_Kind{
   TK_Identifier,
   TK_StringLit,
   TK_U8Lit,
+  TK_Character,
   TK_Error,
   TK_Float,
   TK_Int,
@@ -77,6 +81,7 @@ typedef struct Token{
   union {
     S64 int_val;
     String error_val;
+    Intern_String intern_val;
   };
   
   String file;
@@ -88,6 +93,7 @@ typedef struct Tokens{
   Token *tokens;
   S64 len;
   S64 cap;
+  S64 iter;
 }Tokens;
 
 typedef struct Lex_Stream{
@@ -105,6 +111,8 @@ global String token_kind_string[] = {
   [TK_Error] = lit("Error"),
   [TK_Comment] = lit("Comment"),
   [TK_Identifier] = lit("Identifier"),
+  [TK_Keyword] = lit("Keyword"),
+  [TK_Character] = lit("Character"),
   [TK_StringLit] = lit("StringLiteral"),
   [TK_U8Lit] = lit("U8Literal"),
   [TK_Float] = lit("Float"),