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;
}