Solution Review: Insertion at Tail

mod linked_list; 
use linked_list::*; 

impl LinkedList{
    pub fn insert_at_tail(&mut self, num: i32){
        let mut temp = self.head.as_mut().unwrap();
        while temp.next.is_some(){
            temp = temp.next.as_mut().unwrap();
        }
        let new_node = Node::new(num);
        temp.next = Some(Box::new(new_node));
        
    }
}