add string utils

core.h

@@ -230,6 +230,7 @@ string strReverse(Arena *arena, string str);
 string strSlice(string str, size_t start, size_t stop);
 string strChopStart(string str, size_t start);
 string strSliceCStr(char *data, size_t start, size_t stop);
+inline string strChopStart(string str, size_t start);
 StringList strSplit(Arena *arena, string splitStr, string inputStr);
 string strPrintfv(Arena *arena, const char *fmt, va_list args);
 string strPrintf(Arena *arena, const char *fmt, ...);