7-29 delete substring in string (non KMP)

Input 2 A string S1 and S2, Request to delete string S1 All substrings that appear in S2, That is, the result string cannot contain S2.

Input format ：

Enter in 2 No more than... Are given in each line 80 In characters 、 End with carriage return 2 Non empty strings , Corresponding S1 and S2.

Output format ：

Output the deletion string in one line S1 All substrings that appear in S2 Result string after .

sample input ：

Tomcat is a male ccatat
cat

sample output ：

Tom is a male 

Code ： 

#include<stdio.h>
#include<string.h>
int main()
{
    char s[100];
    char a[100];
    gets(s);gets(a);// Read array  
    int i,j,k;
    i=0;
    int len = strlen(a);// Calculate the length of the array  
 
    while(s[i]!='\0')// Traversal array  
    {
        if(s[i]==a[0])
        {
            int count=0;
            for(j=i;j<i+len;j++)
            {
                if(a[j-i]==s[j]) count++;
            }
            if(count==len)
            {
                for(k=i+len;k<strlen(s);k++)
                {
                    s[k-len]=s[k];
                }
                s[k-len]='\0';
                i=0;
            }
            else i++;
        }
        else i++;
    }
    printf("%s",s);
}