Fix delete and loading lua config dynamically

src/basic/basic.h

@@ -1456,6 +1456,18 @@ String SkipToLastPeriod(String s) {
     return result;
 }
 
+String CutPrefix(String *string, int64_t len) {
+    String result = GetPrefix(*string, len);
+    *string       = Skip(*string, len);
+    return result;
+}
+
+String CutPostfix(String *string, int64_t len) {
+    String result = GetPostfix(*string, len);
+    *string       = Chop(*string, len);
+    return result;
+}
+
 String Merge(Allocator allocator, Array<String> list, String separator = " ") {
     int64_t char_count = 0;
     For(list) char_count += it.len;