fn main() {
    let phrase = "тест";
    for c in phrase.to_lowercase().chars() {
        if let Some(t) = map(c) {
            print!("{}", t);
        } else {
            print!("{}", c);
        }
    }

    println!();
}

fn map(c: char) -> Option<&'static str> {
    match c {
        'а' => Some(":lla:"),
        'б' => Some(":llb:"),
        'в' => Some(":llv:"),
        'г' => Some(":llg:"),
        'д' => Some(":lld:"),
        'е' => Some(":lle:"),
        'ё' => Some(":llyo:"),
        'ж' => Some(":llzz:"),
        'з' => Some(":llz:"),
        'и' => Some(":lli:"),
        'й' => Some(":llii:"),
        'к' => Some(":llk:"),
        'л' => Some(":lll:"),
        'м' => Some(":llm:"),
        'н' => Some(":lln:"),
        'о' => Some(":llo:"),
        'п' => Some(":llp:"),
        'р' => Some(":llr:"),
        'с' => Some(":lls:"),
        'т' => Some(":llt:"),
        'у' => Some(":llu:"),
        'ф' => Some(":llf:"),
        'х' => Some(":llh:"),
        'ц' => Some(":llc:"),
        'ч' => Some(":llch:"),
        'ш' => Some(":llsh:"),
        'щ' => Some(":llssh:"),
        'ъ' => Some(":llis:"),
        'ы' => Some(":lliii:"),
        'ь' => Some(":llik:"),
        'э' => Some(":llee:"),
        'ю' => Some(":lluu:"),
        'я' => Some(":llya:"),
        '0' => Some(":ll:"),
        '1' => Some(":ll1:"),
        '2' => Some(":ll2:"),
        '3' => Some(":ll3:"),
        '4' => Some(":ll4:"),
        '5' => Some(":ll5:"),
        '6' => Some(":ll6:"),
        '7' => Some(":ll7:"),
        '8' => Some(":ll8:"),
        '9' => Some(":ll9:"),
        ',' => Some(":llcomma:"),
        '.' => Some(":lldot:"),
        '!' => Some(":llatt:"),
        '?' => Some(":llques:"),
        _ => None
    }
}