public int AddCoin(Guid id)
{
CoinEntity coinEntity = _coinRepository.Get(id);
CurrentStateEntity currentState = _stateRepository.GetFirst();
_logger.Info(" before add coin");
_printer.CoinAndStateInfo(coinEntity, currentState);
_vengineMachine.AddCoin(coinEntity, currentState);
_logger.Info(" after add coin");
_printer.CoinAndStateInfo(coinEntity, currentState);
_logger.Info(" before _db.SaveChanges()...");
_coinRepository.SaveChanges();
return(currentState.Deposit);
}