Fix warnings

src/storage.rs

@@ -22,6 +22,7 @@ pub trait Storage {
 }
 */
 
+#[derive(Default)]
 pub struct Storage {
     keys: HashMap<String, usize>,
     items: Vec<Item>,
@@ -67,12 +68,3 @@ impl Storage {
         self.keys.keys()
     }
 }
-
-impl Default for Storage {
-    fn default() -> Self {
-        Self {
-            keys: HashMap::new(),
-            items: Vec::new(),
-        }
-    }
-}