solution06 ..........\serie06 ..........\.......\DrinksMachineModel.java ..........\.......\StdDrinksMachineModel.java ..........\.......\util ..........\.......\....\CoinTypes.java ..........\.......\....\DrinkTypes.java ..........\.......\....\MoneyAmount.java ..........\.......\....\StdMoneyAmount.java ..........\.......\....\StdStock.java ..........\.......\....\Stock.java