#include <stdio.h>
int main()
{
    char s1[100], s2[100],s3[100], i, j, y;

    printf("First Name: ");
    scanf("%s", s1);

    printf("Middle Name: ");
    scanf("%s", s2);

    printf("Last Name: ");
    scanf("%s",s3);


    for(i = 0; s1[i] != '\0'; ++i);

    for(j = 0; s2[j] != '\0'; ++j, ++i)

    for(y = 0; s3[y] != '\0'; ++y, ++j, ++i)
    {
        s1[i] = s2[j] & s3[y];
    }

    s1[i] = '\0';
    printf("After concatenation: %s", s1);

    return 0;
}