public string Start(int id) { IRace race = this.raceById[id]; if (race.Participants.Count == 0) { return(NoParticipantsMessage); } if (race.IsOver) { return(string.Empty); } StringBuilder result = new StringBuilder(); result.AppendLine($"{race.Route} - {race.Length}"); result.Append(string.Join(Environment.NewLine, race.GetWinnersInfo())); return(result.ToString()); }