fn new() -> Self {
        MyLinkedList {
            len: 0usize,
            root: None,
        }
    }
/** Initialize your data structure here. */
Initialize your data structure here.
Initialize your data structure here .
fn new() -> Self {
        MyLinkedList {
            len: 0usize,
            root: None,
        }
    }
fn new ( ) -> Self { MyLinkedList { len : 0usize , root : None , } }
Initialize your data structure here.
Initialize your data structure here .