Small clean up

src/storage.rs

@@ -2,6 +2,26 @@ use std::collections::HashMap;
 
 use crate::item::Item;
 
+/*
+pub trait Storage {
+    type Key;
+
+    type IterKeys:
+    type IterItems:
+    type IterItemsMut:
+
+    fn contains_key(&self, key: Self::Key) -> bool;
+    fn insert(&mut self, key: Self::Key, item: Item);
+    fn get_id(&self, key: Self::Key) -> usize;
+    fn get_item(&mut self, id: usize) -> &mut Item;
+    fn item(&self, id: usize) -> &Item;
+    fn item_mut(&mut self, id: usize) -> &mut Item;
+    fn items(&self) -> impl Iterator<Item = &Item>;
+    fn items_mut(&mut self) -> impl Iterator<Item = &mut Item>;
+    fn keys(&self) -> impl Iterator<Item = &String>;
+}
+*/
+
 pub struct Storage {
     keys: HashMap<String, usize>,
     items: Vec<Item>,