#[derive(Clone, Debug)]
pub struct Coord {
    pub x: isize,
    pub y: isize
}

impl Coord {
    pub fn new(x: isize, y: isize) -> Self {
        Self { x, y }
    }

    pub fn invert(&mut self) {
        self.x *= -1;
        self.y *= -1;
    }
}