add: if (!_b) return NULL;
context: char* find_not_quoted(char* _b, char _c){	int quoted = 0;	while (*_b) {		if (!quoted) {			if (*_b == '\"') quoted = 1;			else if (*_b == _c) return _b;		} else {			if ((*_b == '\"') && (*(_b-1) != '\\')) quoted = 0;		}		_b++;	}	return NULL;}