lib: updated filterDuplicateStrings method
Implementation was using a hash map while we are only concerned with the
values of the array iterated that are unique and not in the keys
themselves, so using a set would be a better idea. An interesting point to note is that none of the tests broke after changing the implementation.
I was under the impression from the function name that is performs unique elements from the array but was not so. However, I still don't know the cause of implementing this function in the previous manner as it is being used for uniquely identifying elements.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines