/// A Robot *aka droid* is represented here.
/// Each robot must have a unique id.
pub struct Robot {
    id: u32,
    o: Orientation,
    p: Position,
}

/// Enum to store all possible orientations.
enum Orientation {
    N,
    E,
    S,
    W,
}

/// Struct to store robot position.
struct Position {
    x: i32,
    y: i32,
}