Testing nominal case of the feature oldestPerson
- Feature implemented
- 1 test added
- correct misuse of Stream + refactor on file parsing to force the use of 19th century
- Added to the main
Cleaning Code
Merge branch 'feature/UC/oldestPerson'

* feature/UC/oldestPerson:
  Cleaning Code
  - Feature implemented - 1 test added - correct misuse of Stream + refactor on file parsing to force the use of 19th century - Added to the main
  Testing nominal case of the feature oldestPerson