#include <stdio.h>
#include <conio.h>
#include <string.h>
#include <stdlib.h>
#include <Windows.h>

char *process(char*);

void main()
{
   char a[100], b[100], *r;

   printf("Enter the string to check if it is a palindrome\n");
   gets(a);
   r = process(a);

   strcpy(b,a);
   strrev(b);

   if (strcmp(a,b) == 0)
   {
      printf("%s string is a palindrome.\n",a);
       free(r);
   }
   else
   {
      printf("Entered string is not a palindrome.\n");
       free(r);
   }

   getch();
}

char *process(char *a) {
   int length, c, d;
   char *start;

   c = d = 0;

   length = strlen(a);

   start = (char*)malloc(length+1);

   if (start == NULL)
      exit(EXIT_FAILURE);

   while (*(a+c) != '\0') {
      if (*(a+c) == ' ') {
         int temp = c + 1;
         if (*(a+temp) != '\0') {
            while (*(a+temp) == ' ' && *(a+temp) != '\0') {
               if (*(a+temp) == ' ') {
                  c++;
               }
               temp++;
            }
         }
      }
      *(start+d) = *(a+c);
      c++;
      d++;
   }
   *(start+d)= '\0';

   return start;
}