关于重写重载的有关问题

关于重写重载的问题
下面有两个函数 我感觉这样写是可以的 但是总是编译不过 显示err LNK2005 应该怎么改这东西？求大神指教

C/C++ code

char *GetFileString( char *string, int n, FILE *stream ){    return fgets( string, n, stream );}//wchar_t *GetFileString( wchar_t *string, int n, FILE *stream ){    return fgetws( string, n, stream );}// // // Same with strchrchar *FindCharInString( const char *string, int c ){        // This *should* work OK even with UTF-8, since we're only searching for    // '\n' in practice. Careful if you try to use this for anything other    // than ASCII characters.     return (char*)_mbschr( (const unsigned char *)string, c );}// wchar_t *FindCharInString( const wchar_t *string, wint_t c ){        return (wchar_t *)wcschr( string, c );}