private void UpdateDuelsStatistics()
        {
            var category           = "Wednesday prize";
            var applicantsForPrize = 3;

            var participants = _duels.Where(d => d.StartTime.Date == DateTime.Today).GroupBy(d => d.Winner)
                               .OrderByDescending(d => d.Count()).Select(d => new ParticipantDto
            {
                Email         = d.First().Winner,
                Name          = _users.FirstOrDefault(u => u.Email.Equals(d.First().Winner))?.FullName,
                Picture       = _users.FirstOrDefault(u => u.Email.Equals(d.First().Winner))?.Picture,
                TodaysBalance = d.Count()
            }).ToList();

            var participantsNeeded = applicantsForPrize + _prizes.Count(p => p.Category.Equals(category));

            participants = participants.Take(participantsNeeded).ToList();
            if (participantsNeeded > participants.Count)
            {
                while (participantsNeeded > participants.Count)
                {
                    participants.Add(new ParticipantDto());
                }
            }

            var i     = 0;
            var prize = _prizes.FirstOrDefault(p => p.Category.Equals(category));

            if (prize == null)
            {
                _duelsStatistics = new PrizeAndApplicantDto();
            }

            _duelsStatistics = new PrizeAndApplicantDto
            {
                Id         = prize.Id,
                Name       = prize.Name,
                Picture    = prize.Picture,
                Price      = prize.Price,
                Quantity   = prize.Quantity - _purchases.Count(np => np.PrizeId == prize.Id),
                Category   = prize.Category,
                Applicants = participants.Skip(i++).Take(applicantsForPrize)
            };
        }
 private void UpdateWeekPrizes()
 {
     _weeksPrize = UpdatePrizesByCategory("Week prize");
 }
        private void UpdateTodayPrizes()
        {
            var weekday = DateTime.Today.ToString("dddd");

            _todaysPrize = UpdatePrizesByCategory($"{weekday} prize");
        }