Refactor remove duplicates to more pythonic (#2093)

* Refactor strings/remove_duplicate to more pythonic

* updating DIRECTORY.md

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>

mateuszz0000 committed 5y ago

3de6f010c364b4d1942a31204e6a8dd348e904f0

Parent: bf0da25

Committed by GitHub <noreply@github.com> on 6/11/2020, 4:13:40 AM