#include <stdio.h>
#include <string.h>
 
int main() {
    char str[200], result[200];
    int i, j, k = 0;
    int len;
    int found;
 
    // Input string
    printf("Enter a string: ");
    fgets(str, sizeof(str), stdin);
 
    len = strlen(str);
 
    // Remove newline character (if present)
    if (str[len - 1] == '\n')
        str[len - 1] = '\0';
 
    // Traverse each character
    for (i = 0; str[i] != '\0'; i++) {
        found = 0;
 
        // Check if character already exists in result
        for (j = 0; j < k; j++) {
            if (str[i] == result[j]) {
                found = 1;
                break;
            }
        }
 
        // If not found, add it to result
        if (!found) {
            result[k++] = str[i];
        }
    }
 
    result[k] = '\0'; // Null terminate the result string
 
    printf("String after removing duplicate characters: %s\n", result);
 
    return 0;
}