refactor!: remove get_identifier_without_leaf

remove as its no longer used either internally or in mqttui for some time.
Either its quickly implemented yourself or `Vec::pop()` does the job better.

src/identifier.rs

@@ -1,27 +0,0 @@
-/// Split an `Identifier` into its branch and leaf.
-///
-/// # Examples
-///
-/// ```
-/// # use tui_tree_widget::get_identifier_without_leaf;
-/// let (branch, leaf) = get_identifier_without_leaf(&[2, 4, 6]);
-/// assert_eq!(branch, [2, 4]);
-/// assert_eq!(leaf, Some(&6));
-///
-/// let (branch, leaf) = get_identifier_without_leaf(&[2]);
-/// assert_eq!(branch, []);
-/// assert_eq!(leaf, Some(&2));
-///
-/// let (branch, leaf) = get_identifier_without_leaf::<usize>(&[]);
-/// assert_eq!(branch, []);
-/// assert_eq!(leaf, None);
-/// ```
-#[must_use]
-pub const fn get_without_leaf<Identifier>(
-    identifier: &[Identifier],
-) -> (&[Identifier], Option<&Identifier>) {
-    match identifier {
-        [branch @ .., leaf] => (branch, Some(leaf)),
-        [] => (&[] as &[Identifier], None),
-    }
-}

src/lib.rs

@@ -17,12 +17,10 @@ use ratatui::widgets::{Block, Scrollbar, ScrollbarState, StatefulWidget, Widget}
 use unicode_width::UnicodeWidthStr;
 
 mod flatten;
-mod identifier;
 mod item;
 mod state;
 
 pub use crate::flatten::Flattened;
-pub use crate::identifier::get_without_leaf as get_identifier_without_leaf;
 pub use crate::item::Item as TreeItem;
 pub use crate::state::State as TreeState;