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Wrap Collection Hints

Wrap Collection Hints

Introduce a new class, RpnStack. This class will wrap the Stack<BigDecimal>. Then update the RpnCalculator to use this new class.

You will need to have a few methods in your RpnStack class:

Make sure you initialize your collection of values in the constructor of RpnStack.

Also make sure to remove the Stack<BigDecimal> from the RpnCalculator class.

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