* Char array to string and string to char array test cases added
* Minor code renames
* Added groupingBy collector unit tests
* Added test case for int summary calculation on grouped results
* Added the grouping by classes to the main source path
* Reverting char array to string test class
* Reverting char array to string test class
* Reverting char array to string test class
* Reverting char array to string test class
* Unit test class for Kotlin when block + required types
* Minor changes to kotlin when block tests
* Minor change
* Minor change
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