Simple node struct for making a tree

node.rs

use helpers;
use std::fmt;

#[derive(Debug)]
pub struct Node {
    pub left_child: Option<Box<Node>>,
    pub right_child: Option<Box<Node>>,
    pub has_fruit: bool,
}

impl Node {
    pub fn random_tree() -> Node {
        let has_left = helpers::coin_flip();
        let has_right = helpers::coin_flip();
        let mut left: Option<Box<Node>> = None;
        if has_left {
            left = Some(Box::new(Node::random_tree()));
        }

        let mut right: Option<Box<Node>> = None;
        if has_right {
            right = Some(Box::new(Node::random_tree()));
        }

        Node {
            left_child: left,
            right_child: right,
            has_fruit: helpers::coin_flip(),
        }
    }
}