🧑‍💻: Refactor if-elif to match-case in main menu (Python 3.10+)

[gargi612]

Title

Refactor if-elif to match-case in main menu (Python 3.10+) in Anime_manga_tracker from beginners project

Enhancement Aim

Currently, the main menu logic in main() uses multiple if-elif statements to handle user choices. Since Python 3.10+, match-case can be used as a cleaner and more modern alternative to simplify this logic.

Benefits

• Improves readability and maintainability
• Makes use of modern Python syntax
• Cleaner control flow

Changes

Refactor the main if-elif structure to use match-case, like:

match choice:
    case '1':
        ...
    case '2':
        ...
    case _:
        print("Invalid choice")


### Screenshots 📷

_No response_

### Guidelines

- [x] I have read the guidelines
- [ ] I have the link to my latest merged PR

### Full Name

Gargi Meena 

### Participant Role

GSSOC 25 contributor

[github-actions[bot]]

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[nikhil123421]

Hi! I've completed the requested changes and submitted the PR. Kindly add the appropriate labels/tags (e.g., "GSSOC25", "Level", etc.) to the issue for proper tracking. Thank you! 🙏😊

[UTSAVS26]

Hi! I've completed the requested changes and submitted the PR. Kindly add the appropriate labels/tags (e.g., "GSSOC25", "Level", etc.) to the issue for proper tracking. Thank you! 🙏😊

Hi @nikhil123421 i appreciate the work you have done by submitting the PR, but you can only raise the PR if the issue has been assigned to you. So for that note I am closing your PR.

[gargi612]

Hi! I've completed the requested changes and submitted the PR #1482 . Kindly check ,Thank you!

[gargi612]

Hi! I've completed the requested changes and submitted the PR #1487 . Kindly check ,Thank you!