fn blend(colors: impl IntoIterator<Item = Hex>) -> Option<Hex> {
    let mut count = 0;
    let mut a_sum = 0.0;
    let mut b_sum = 0.0;
    let mut c_sum = 0.0;

    for color in colors {
        let Hex(a, b, c) = color;

        count += 1;
        a_sum += f64::from(a);
        b_sum += f64::from(b);
        c_sum += f64::from(c);
    }

    match count {
        0 => None,
        _ => {
            let count = f64::from(count);

            Some(Hex(
                (a_sum / count).round() as u8,
                (b_sum / count).round() as u8,
                (c_sum / count).round() as u8,
            ))
        }
    }
}