Will try to code in crisp manner.

#include <stdio.h>
#include <cs50.h>
#include <string.h>
#include <ctype.h>

 int main()
{
   string answer;
   for (int i = 0; i < 1)
   {
      printf("Is your code crisp ? \n");
      scanf("%s", &answer);
      if (toupper(answer) == "YES")
      {
         printf("Your code is absolutely crisp");
      }
   }
}