public BarbellPosition(MonthDate month, float selic, float ipca, float stocks, float dolar)
 {
     Month  = month;
     Selic  = selic;
     Ipca   = ipca;
     Stocks = stocks;
     Dolar  = dolar;
 }
 static void PrintMonth(MonthDate month, BarbellWallet wallet)
 {
     Console.WriteLine($"{month}: {wallet.Balance:C0}");
 }
 public Position(MonthDate month, float value)
 {
     Month = month;
     Value = value;
 }
 public Position AsPosition() => new Position(MonthDate.From(Date), Value);