raceManager.swift

class RaceManager: HorseRaceDelegate {
    
    let race: Race
    
    init(race: Race) {
        self.race = race
        race.delegate = self
        race.start()
    }
    
    func race(_ race: Race, didStartAt time: Date) {
        // some implementation
    }
    
    func addLapLeader(_ horse: Horse, forLap lap: Int, atTime time: Date) {
        // some implementation
    }
    
    func race(_ race: Race, didEndAt time: Date, withWinner winner: Horse) {
        // some implementation
    }
}