[#148] style: fix style - Eric

[e0958902]

Checklist for feature implementation and modification

Closes #148

• [x] Added relevant milestone (under milestone tab on the right)
• Documentation
  • [x] JavaDoc for classes and methods

Checklist for non-implementation related PR

Closes #148

• [x] Added relevant milestone (under milestone tab on the right)
• Documentation (Contributions)
  • [x] Miscellaneous and team-based admin tasks (if any)

Additional Information

Fixes styles in the following files:

1. ListCommand
2. ListCommandTest ListCommandTest checks is intended to have some failing checks as the methods authored by @T0nyLin
3. ViewCommand
4. ViewCommandTest
5. MedicationManagerTest
6. Medication