private void BuySnack(string positionString)
{
int position = int.Parse(positionString);
string error = _snackMachine.CanBySnack(position);
if (error != string.Empty)
{
NotifyClient(error);
return;
}
_snackMachine.BuySnack(position);
snackMachineRepository.Save(_snackMachine);
NotifyClient("You have bought a snack");
}