hoge.rs

fn byte_to_ascii(byte: u8) -> [u8; 8] {
    let diag = 0b10000000_01000000_00100000_00010000_00001000_00000100_00000010_00000001u64;

    let mut byte_ascii = byte as u64 * diag;
    byte_ascii &= 0x8080808080808080;
    byte_ascii >>= 7;
    byte_ascii += 0x3030303030303030;

    byte_ascii.to_le_bytes()
}