let secret = "AZKXE3W57Q53ESFUWY4TKEAXIGLC7STL".as_bytes();
// let secret: Vec<u8> = repeat_with(|| fastrand::u8(..)).take(20).collect();

let totp = TOTP::with_default(secret, "MY-PC", "user@localhost");
let timestamp = SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs();
let url = totp.get_url();
println!("{}", url);
println!("{}", totp.verify("input you code", timestamp));

// let qrcode = fast_qr::QRBuilder::new(url).build().unwrap();
// let _svg = SvgBuilder::default().shape(Shape::RoundedSquare).to_file(&qrcode, "out.svg");