Check if a string is a palindrome with the use of two pointers

Given a string , check whether the reverse read of the string is same and print as "palindrome" if it does else print "not a palindrome" using two pointers with one pointer pointing to the starting index of the string and other pointer pointing to the ending index of the string.

#include <stdio.h>
int main(void) {
   char *s,*e;
   int flag=1;
   s=(char*)malloc(sizeof(char));
   scanf("%s",s);
   e=(s+strlen(s)-1);
   while(s!=e && (abs(s-e))!=1)
   {
     if(!(*s==*e))
     {
      flag=0;
      break;
     }
     s++;
     e--;
   }
   if(flag)
    printf("palindrome");
   else
    printf("not palindrome");
   return 0;
}