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());
}