[Feat]: Resolved issue #35 and improved bot.js

[Yash-Vashishth]

Hi @jinx-vi-0 !! In accordance with issue #35 raised by me I have made the neccessary changes in the bot.js file .Improvements Made:

1. Modularization: Split the messageCreate event handler into separate functions for each command.
2. Error Handling: Improved error handling with more informative messages.
3. Consistent Naming Conventions: Followed consistent naming conventions and code formatting.
4. Code Formatting: Organized code for better readability.
5. Caching: Cached LeetCode problems to reduce API calls.
6. Documentation: Added inline comments for clarity.

Please merge my file into the main branch and also add the gssoc-ext , hacktoberfest and level3 labels to the pr.

Thanks,
Yash Vashishth
(Contributor, GSSoC'24 and hacktoberfest)

[github-actions]

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[Yash-Vashishth]

Hi @jinx-vi-0!! Please atleast please merge this commit to the main branch and add labels. I have made many changes to the code