Just copy the struct and create the simple methods for creating the children nodes.

Something like this:

struct Node {
    value: u32,
    left: Option<Box<Node>>,
    right: Option<Box<Node>>,
}

impl Node {
    fn new(value: u32) -> Self {
        Node {
            value,
            left: None,
            right: None,
        }
    }

    fn left(mut self, node: Node) -> Node {
        self.left = Some(Box::new(node));
        self
    }

    fn right(mut self, node: Node) -> Node {
        self.right = Some(Box::new(node));

        self
    }
}

How am i supposed to import this "preloaded" module from rust into my working ide? I can't find it anywhere.

Thanks! It's my first test here, it works now.

You must return the result, not print it.

Ok, for some reason, the output taken by answer is "None: None" instead of my code output. As follow:

Test Results:
Log
There are 17 in total.
There are 17 sheeps in total, not None: None should equal 17
Log
There are 500 in total.
There are 500 sheeps in total, not None: None should equal 500
Log
There are 0 in total.
There are no sheeps at all, you counted None: None should equal 0