simplify the tree structure code

src/main.rs

@@ -15,7 +15,7 @@ impl File {
     fn new(name: String) -> Self {
         Self {
             size: *&name.len() as u64,
-            name: name,
+            name,
         }
     }
 }
@@ -36,11 +36,7 @@ fn main() {
     for x in tree.traverse_pre_order(&root_id.unwrap()).unwrap() {
         println!("Parent: {:?}", x.data());
         for y in x.children() {
-            if tree.get(y).unwrap().children().is_empty() {
-                println!("No Children");
-            } else {
-                println!("  Children: {:?}", tree.get(y).unwrap().data());
-            }
+            println!("  Children: {:?}", tree.get(y).unwrap().data());
         }
     }
 }