int main(int argc, char **argv) {
    if (argc != 3) {
        printf("Invalid\n");
    }
    else {
        if (argv[1] == argv[2]) {
            printf("Same\n");
        }
        else {
            printf("Different\n");
        }
    }
    return 0;
}
compare argv[1] to argv[2] without using strcmp