50.To sort a string in alphabetical order

#include <stdio.h>

#include <string.h>

#include <malloc.h>

char* substring(char*, int, int);

int main()

{

   char string[100], *pointer;

   int position = 1, length = 1, temp, string_length;

   printf("Enter a string\n");

   gets(string);

   temp = string_length = strlen(string);

   printf("Substring of \"%s\" are\n", string);

   while (position <= string_length)

   {

      while (length <= temp)

      {

         pointer = substring(string, position, length);

         printf("%s\n", pointer);

         free(pointer);

         length++;

      }

      temp--;

      position++;

      length = 1;

   }

   return 0;

}