Program to encrypt message or number using c programming

// program to encrypt a message

#include<stdio.h>

#include<string.h>

int main() {

    char input[100];

    char encrypted[100];

    printf("enter msg/no. :");

    scanf("%s", input);

    printf("\033[H\033[J");

    int length = strlen(input);

    encrypted[0] = input[0];

    encrypted[1] = input[1];

    for(int j = 2; j < length; j++) {

        encrypted[j] = 'x';

    }

    encrypted[length-2] = input[length-2];

    encrypted[length-1] = input[length-1];

    printf("%s",encrypted);

}