public virtual HashSet <Banknote> CacheOut(int value, CurrencyType currencyType, HashSet <Banknote> banknotes)
{
switch (_nextHandler)
{
case null when value != 0:
return(null);
case null when value == 0:
return(banknotes);
default:
return(_nextHandler?.CacheOut(value, currencyType, banknotes));
}
}
public void CacheOut(int value, CurrencyType currencyType)
{
var banknotes = _handler.CacheOut(value, currencyType, new HashSet <Banknote>());
if (banknotes == null)
{
Console.WriteLine("Not valid input");
}
else
{
Console.WriteLine("Success!");
foreach (var banknote in banknotes.ToList().OrderByDescending(x => x.Value))
{
Console.WriteLine($"{banknote.Value} {banknote.Currency}");
}
}
}