Ogham transliterator in Rust

ogham.rs

fn transliterate(ogham: &str) -> String {
    ogham.chars().filter_map(|token| match token {
        ' ' => Some(" "),
        'ᚁ' => Some("B"),
        'ᚂ' => Some("L"),
        'ᚃ' => Some("F"),
        'ᚄ' => Some("S"),
        'ᚅ' => Some("N"),
        'ᚆ' => Some("H"),
        'ᚇ' => Some("D"),
        'ᚈ' => Some("T"),
        'ᚉ' => Some("C"),
        'ᚊ' => Some("Q"),
        'ᚋ' => Some("M"),
        'ᚌ' => Some("G"),
        'ᚍ' => Some("NG"),
        'ᚎ' => Some("Z"),
        'ᚏ' => Some("R"),
        'ᚐ' => Some("A"),
        'ᚑ' => Some("O"),
        'ᚒ' => Some("U"),
        'ᚓ' => Some("E"),
        'ᚔ' => Some("I"),
        'ᚕ' => Some("EA"),
        'ᚖ' => Some("OI"),
        'ᚗ' => Some("UI"),
        'ᚘ' => Some("IA"),
        'ᚙ' => Some("AE"),
        'ᚚ' => Some("P"),
        _ => None,
    }).fold(String::new(), |s, frag| s + frag)
}

fn main() {
    println!("{}", transliterate("᚛ᚊᚏᚔᚋᚔᚈᚔᚏ ᚏᚑᚅᚐᚅᚅ ᚋᚐᚊ ᚉᚑᚋᚑᚌᚐᚅᚅ᚜"));
}

run

$ rustc ogham.rs
$ ./ogham
QRIMITIR RONANN MAQ COMOGANN