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* Update chunked_array.hpp

* Update ChunkedArray_API_extensions.i

* Update StringArray.i

* apply cpplint to cpp tests

* Update test_chunked_array to please cpplint (#4121)

* Update test_chunked_array to please cpplint

* Simplify var name

* Add comment
Co-authored-by: Alberto Ferreira <AlbertoEAF@users.noreply.github.com>