fn main() {
    let f = |v| String::from_utf8(v).map(|s| s.chars().map(|c| c as u32).collect::<Vec<u32>>());
    let g = |v: Vec<_>| {
        print!("{:?}\n=> ", v.iter().map(|b| format!("{:X}", b)).collect::<Vec<_>>());
        match f(v) {
            Ok(cs) => println!("{:?}\n", cs.iter().map(|c| format!("U+{:04X}", c)).collect::<Vec<_>>()),
            Err(e) => print!("{:?}\n", e.to_string())
        }
    };
    g(vec!(0x6F, 0x64, 0x61, 0x69));
    g(vec!(0xE3, 0x81, 0x8A, 0xE9, 0xA1, 0x8C));
    g(vec!(0xC2, 0xA9, 0xF0, 0x9F, 0x8D, 0x94, 0xE9, 0xA6, 0x99, 0x41));
    g(vec!(0xC2, 0xA9, 0xF0));
}
 

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