numeronym 1.4.2

n7m
Documentation 
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pub fn numeronym(word: &str) -> String {
    if word.chars().count() < 2 {
        String::from(word)
    } else {
        let len = word.chars().count() - 2;
        let (_, first) = word.char_indices().nth(0).unwrap_or((0, ' '));
        let (_, last) = word.char_indices().last().unwrap_or((0, ' '));
        format!("{}{}{}", first, len, last)
    }
}

#[cfg(test)]
mod test {
    use super::numeronym;

    #[test]
    fn kubernetes() {
        assert_eq!("k8s", &numeronym("kubernetes")[..]);
    }

    #[test]
    fn おはようございます() {
        assert_eq!("お7す", &numeronym("おはようございます")[..]);
    }

    #[test]
    fn zero() {
        assert_eq!("h0i", &numeronym("hi")[..]);
    }
}