Function a_or_an

pub fn a_or_an(word: &'static str) -> &'static str

Returns indefinite article “a” or “an” that corresponds to the word, or an empty string if the indefinite article do not fit to the word.

Note that the function does not recognize plurals and assumes that the word is in singular.

If an article is returned, it is followed by a space, e.g. “a “.