Invert UTF8 QR-Codes

main.rs

#![feature(io)]

use std::io::{stdin,Read};

fn translate(ch: char) -> char {
    match ch {
        ' ' => '█',
        '█' => ' ',
        '▀' => '▄',
        '▄' => '▀',
        _   => ch,
    }
}

fn main() {
    for ch in stdin().chars() {
        print!("{}", translate(ch.unwrap()));
    }
}