Rework search command with new username helper functions

[TimJentzsch]

Relevant issue: Closes #123

Description:

The new username helper functions weren't applied everywhere in the search command, resulting in the 'me' keyword not working correctly.

Checklist:

• [x] Code Quality
• [x] Pep-8
• [ ] Tests (if applicable)
• [x] Success Criteria Met
• [x] Inline Documentation
• [ ] Wiki Documentation (if applicable)