pub fn add(players: Players, player: Player, direction: Coordinate) -> Players

pub fn get_current(players: Players) -> Player

pub fn get_facing(players: Players, player: Player) -> Coordinate

pub fn get_player(players: Players, at: Int) -> Player

pub fn get_players(players: Players) -> List(Player)

pub fn new() -> Players

pub fn rotate(players: Players) -> Players