Function provide_prefix

pub fn provide_prefix<I, F>(items: &[I], is_parent_of: F) -> Vec<String>
where
    F: Fn(&I, &I) -> bool,

Generate a list of prefix to display items as a tree (multi-root)

• the input should be sorted in the target display order
• the input order of ìtems is preserved into output
• the input order is used to ask for parent of item (parent should be before child)
• output as the same number of element than input items
• output can be zipped with input ìtems
• is_parent_of(maybe_parent, item)