fn start() {
    def str = getline("Testing: ");

    print("You said: `");
    cprint(str);
    print("`");

    free(str, 128);
}

fn neq(ch1, ch2) {
    if sub(ch1, ch2) { return 1; }
    else { return 0; }
}

fn mul(m, n) {
    def result = m;
    while n {
        result = add(result, m);
        n = sub(n, 1);
    }
    return result;
}


fn getline(prompt) {
    print(prompt);
    def str = alloc(128);

    def counter = 0;
    def input = getch();
    def running = mul(neq(input, '\n'), neq(input, 0));
    while running {
        *add(str, counter) = input;
        input = getch();
        counter = add(counter, 1);
        running = mul(neq(input, '\n'), neq(input, 0));
    }

    return str;
}

// free_byte only frees a single cell, so free must be implemented manually
fn free(ptr, size) {
    while size {
        size = sub(size, 1);
        // free_byte is built in
        free_byte(add(ptr, size));
    }

    // Store 0 in the return register
    return 0;
}