style: split import groups correctly

examples/example.rs

@@ -3,7 +3,6 @@ use ratatui::backend::{Backend, CrosstermBackend};
 use ratatui::style::{Color, Modifier, Style};
 use ratatui::widgets::{Block, Scrollbar, ScrollbarOrientation};
 use ratatui::{Frame, Terminal};
-
 use tui_tree_widget::{Tree, TreeItem, TreeState};
 
 struct App<'a> {

src/lib.rs

@@ -13,14 +13,14 @@ use ratatui::style::Style;
 use ratatui::widgets::{Block, Scrollbar, ScrollbarState, StatefulWidget, Widget};
 use unicode_width::UnicodeWidthStr;
 
-mod flatten;
-mod tree_item;
-mod tree_state;
-
 pub use crate::flatten::Flattened;
 pub use crate::tree_item::TreeItem;
 pub use crate::tree_state::TreeState;
 
+mod flatten;
+mod tree_item;
+mod tree_state;
+
 /// A `Tree` which can be rendered.
 ///
 /// The generic argument `Identifier` is used to keep the state like the currently selected or opened [`TreeItem`]s in the [`TreeState`].