实现strstr函数

 一个字符串有没有在另一个字符串出现过

char* my_strstr(char* arr1, char* arr2)
{char* cp;char* a1;char* a2;cp = arr1;while (*cp){a1 = cp;a2 = arr2;while (*a1 == *a2){a1++;a2++;}if (*a2 == '\0'){return cp;}cp++;}return NULL;
}
int main()
{char arr1[] = "abbbcdefgi";char arr2[] = "bbc";char* ret = my_strstr(arr1, arr2);if (ret == NULL){printf("找不到\n");}else{printf("%s", ret);}return 0;
}