Wrote all the function definitions for the manager sub system.

Description

I added the function definitions and documentation for all the functions needed in the manager sub system. And resolved the pre-commit bugs.

Related Issue(s)

#15

Changes Made

• Change 1: Added all the function definitions with poor documentation.
• Change 2: Applied in-depth details for each function and resolved pre-commit bugs.
• Change 3: Added "add member", "remove member", etc to the docstring at the top of the file.
• Change 4: Fixed what I missed in Change 3. And added more specifics for the manager menu.

Test Plan

Same tests as any other change.

Checklist

• Code follows the project's coding style and conventions.
• Automated tests for the changes have been added or existing tests have been updated.
• [] Code coverage for new or modified code is maintained or improved.
• The code builds and runs without errors or warnings.
• Documentation has been updated to reflect the changes made.
• All discussions and feedback on the PR have been addressed.
• CI/CD pipelines pass successfully, including any required checks or tests.
• [] The PR has been reviewed and approved by the designated reviewers.

Reviewers

@reviewer1 @reviewer2