int *a,*b,*p;
p = string;

for (p = string; *p != '\0'; p++) {
       // check for odd length palindrome

       a = p-1;
       b = p+1;

       while (*a == *b && *a && *b) {
	    //make sure string is prepended by a '\0'
	    len++;
       }

       if (len > max_len)
	    max_len = len;

       //check for even length palindrome

       if (*p != *(p+1))
	    continue;
       a = p-1;
       b = p+2;
       while (*a == *b && *a && *b) {
	    //make sure string is prepended by a '\0'
	    len++;
       }
       if (len > max_len)
	    max_len = len;

}
return max_len;