Check if two strings are equal without using library function strcmp()

Given two strings, check whether both of the strings are equal or else print the difference of first non-ascii characters of both strings.

#include <stdio.h>
#include<string.h>
#include<stdlib.h>
int compare(char *s,char *v)
{
   printf("%s ",s);
   printf("and %s ",v);
   while(*s && (*s==*v))
   {
     s++;
     v++;
   }
   return (*s-*v);
}

int main(void) {
 char *s,*v;
   s=(char*)malloc(sizeof(s));
   v=(char*)malloc(sizeof(v));
   scanf("%s",s);
   scanf("%s",v);
   if(compare(s,v)==0)
    printf("are Equal");
   else
    printf("are not Equal");
   return 0;
}