heck

Function transform

source 
pub(crate) fn transform<F, G>(
    s: &str,
    with_word: F,
    boundary: G,
    f: &mut Formatter<'_>,
) -> Result
where
    F: FnMut(&str, &mut Formatter<'_>) -> Result,
    G: FnMut(&mut Formatter<'_>) -> Result,