char * _nc_strstr(const char *haystack, const char *needle)
_nc_strstr(const char *haystack, const char *needle)
char * _nc_strstr(const char *haystack, const char *needle){	size_t len1 = strlen(haystack);	size_t len2 = strlen(needle);	char *result = 0;	while ((len1 != 0) && (len1-- >= len2)) {		if (!strncmp(haystack, needle, len2)) {			result = haystack;			break;		}		haystack++;	}	return result;}