Design a class named Stock that contains the following:
1. A Symbol enum field named symbol for the stock’s symbol.
2. A double data field named previousClosingPrice that stores the stock price for the previous day.
3. A double data field named currentPrice that stores the stock price for the current time.
4. A constructor that creates a stock with specified symbol and name.
5. The accessor functions for all data fields.
6. The mutator functions