impl Default for Floor {
    /// Create a new, empty row
    fn default() -> Self {
        Self {
            rows: vec![],
            coverage: 0,
            complete: false,
        }
    }
}

    let row = Row {
        planks: vec![],
        full: false,
        coverage: 0,
    };
    let floor = Floor {
        rows: vec![row],
        complete: false,
        coverage: 0,
    };

    let row: Row = Default::default();
    let floor: Floor = Default::default();