C语言程序输出桢头到帧尾的字符创串

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#include <stdio.h>

char * find_aim_str(char *head, char *tail, char *src)
{
    char *temp;

    int h_len = strlen(head);
    int t_len = strlen(tail);

    while(*src != '\0')
    {
        if(my_strncmp(src,head,h_len) == 0)
{
            temp = src;
     src = src + h_len;

     while(*src != '\0')
     {
        if(my_strncmp(src,tail,t_len) == 0)
        {
                  *(src + t_len) = '\0';
    return temp;
        }

src++;
}

return NULL;
}

src++;
}

return NULL;
}

#include <stdio.h>
#include <string.h>

#define MAX_SIZE 1024

int main()
{
    char src[MAX_SIZE];
    char head[MAX_SIZE];
    char tail[MAX_SIZE];

printf("Please input src string:\n");
scanf("%s",src);

    printf("Please input head string:\n");
    scanf("%s",head);

    printf("Please input tail string:\n");
    scanf("%s",tail);

    char *result = find_aim_str(head,tail,src);

    printf("result string = %s\n",result);

    return 0;
}

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