in Rust macroquad engine, how to make sure one moving direction is selected

im coding a snake game in rust to learn the macroquad engine, im still a rust beginner and really interested in the language

the problem is i dont seem to be able to make the snake go in a single direction, like if the head is going up, dont go down at the same time

here is the update method used on the head of the snake

 pub fn update(&mut self, dt: f32) {
    let v_mv = match (is_key_down(KeyCode::Down), is_key_down(KeyCode::Up)) {
        (true, false) => 1f32,
        (false, true) => -1f32,
        _ => 0f32,
    };
    let h_mv = match (is_key_down(KeyCode::Right), is_key_down(KeyCode::Left)) {
        (true, false) => 1f32,
        (false, true) => -1f32,
        _ => 0f32,
    };
    self.player.x += dt * PLAYER_SPEED * h_mv;
    self.player.y += dt * PLAYER_SPEED * v_mv;
}

there is nothing preventing the snake from moving in x and y at the same time.

>Solution :

I would merge the two matches:

pub fn update(&mut self, dt: f32) {
    let (v_mv, h_mv): (f32, f32) = match (
        is_key_down(KeyCode::Down),
        is_key_down(KeyCode::Up),
        is_key_down(KeyCode::Right),
        is_key_down(KeyCode::Left),
    ) {
        (true, false, false, false) => (1.0, 0.0),
        (false, true, false, false) => (-1.0, 0.0),
        (false, false, true, false) => (0.0, 1.0),
        (false, false, false, true) => (0.0, -1.0),
        _ => (0.0, 0.0),
    };

    self.player.x += dt * PLAYER_SPEED * h_mv;
    self.player.y += dt * PLAYER_SPEED * v_mv;
}