Write a program to remove all repeated characters from a given string

Write a program to remove all repeated characters from a given string.

1. #include <stdio.h>
2. #include <string.h>
3.  
4. void main()
5. {
6.             char str[100];
7.             int i, j, k;
8.  
9.             printf("Please enter any string :  ");
10.             gets(str);
11.                        
12.             for(i = 0; i < strlen(str); i++) {
13.                         for(j = i + 1; str[j] != '\0'; j++) {
14.                                     if(str[j] == str[i]) {
15.                                                 for(k = j; str[k] != '\0'; k++) {
16.                                                             str[k] = str[k + 1];
17.                                                 }
18.                                     }
19.                         }
20.             }
21.             printf("After removing all repeated characters = %s ", str);
22. }