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Describe your change:

This PR modifies a current algorithm forAllCombinationsOfSizeK. Four parameters made up the originalfindCombinations() method, and they were duplicated for each stack call. Since the modifications are kept in the instance variables, the modifiedfindCombinations() method does not require any parameters. In this case, there will befar fewer local variables that need to be initialized overall on each recursive call.
There was also a for loop in the original technique. The updates function isentirely recursive and lacks a for loop.

Checklist:

• I have readCONTRIBUTING.md.
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