refactor: some generic cleanup
refactor: some generic cleanup

Bugfry/exercism,Bugfry/exercism,Bugfry/exercises,Bugfry/exercism,Bugfry/exercises,Bugfry/exercises,Bugfry/exercises,Bugfry/exercism,Bugfry/exercism,Bugfry/exercism,Bugfry/exercises,Bugfry/exercises