private async Task SingUsersForContest(ISignService signService, List <string> contestarsIds, List <int> contestIds)
{
foreach (var contestId in contestIds)
{
foreach (var contestantId in contestarsIds)
{
if (!signService.UserAlreadyRegisteredForCompetition(contestantId, contestId))
{
await signService.RegisterForContestAsync(contestantId, contestId);
}
}
}
}
