C program to sort a string in alphabetic order

C program to sort a string in alphabetic order: For example if user will enter a string "programming" then output will be "aggimmnoprr" or output string will contain characters in alphabetical order.

C programming code

#include <stdio.h>

#include<conio.h>

#include <stdlib.h>

#include <string.h>

void sort_string(char*);

void main()

{

   char string[100];

   clrscr();

   printf("Enter some text\n");

   gets(string);

   sort_string(string);

   printf("%s\n", string);

   getch();

}

void sort_string(char *s)

{

   int c, d = 0, length;

   char *pointer, *result, ch;

   length = strlen(s);

   result = (char*)malloc(length+1);

   pointer = s;

   for ( ch = 'a' ; ch <= 'z' ; ch++ )

   {

      for ( c = 0 ; c < length ; c++ )

      {

         if ( *pointer == ch )

         {

            *(result+d) = *pointer;

            d++;

         }

         pointer++;

      }

      pointer = s;

   }

   *(result+d) = '\0';

   strcpy(s, result);

   free(result);

}

Output of program: