This task is dedicated to the process of updating multiple classes to satisfy the requirements given in the second part of the Millions project description. This task includes: - Updating stock class with getter methods for historical prices (all prices), lowest price, highest price, and latest price change (0 if first price) - Updating exchange class with methods for getting gainers and losers on the exchange this week. - Update portfolio class with method for getting networth, including the effective value of owned shares. - Update player class with method for getting networth, including the effective value of owned shares.