fn print_printable_or_dot(chunk: &[u8]) {
    for (idx, byte) in chunk.iter().enumerate() {
        if idx > 0 && idx % 8 == 0 {
            print!(" ");
        }

        if *byte >= 32 && *byte <= 126 {
            print!("{}", String::from_utf8(vec![*byte]).unwrap());
        } else {
            print!(".");
        }
    }
}

fn print_offset(offset: usize) {
    print!("{:08x}  ", offset);
}

fn print_data_hex(chunk: &[u8]) {
    for (idx, byte) in chunk.iter().enumerate() {
        if idx > 0 && idx % 8 == 0 {
            print!("  ");
        }
        print!("{:02x} ", byte);
    }
}

pub fn print_hex(data: &[u8]) {
    let mut offset = 0usize;

    let chunks: Vec<&[u8]> = data.chunks(16).collect();

    for chunk in chunks {
        print_offset(offset);
        print_data_hex(chunk);
        print_printable_or_dot(chunk);
        println!();
        offset += 16;
    }
}