Fixed some bugs and added functionality to add difficulty

[Priyansh61]

Overview

1. This PR fixes or fixes part of NA
2. This PR does the following: Adds difficulty score when a user submits PR.

Essential Checklist

• [x] The PR title starts with "Fix #bugnum: ", followed by a short, clear summary of the changes. (If this PR fixes part of an issue, prefix the title with "Fix part of #bugnum: ...".)
• [x] "Allow edits from maintainers" is checked. (See here for instructions on how to enable it.)
• [x] The PR is made from a branch that's not called "main/master".

Proof that changes are correct

PR Pointers

• If you need a review or an answer to a question, and don't have permissions to assign people, leave a comment like the following: "{{Question/comment}} @{{reviewer_username}} PTAL".
• Never force push. If you do, your PR will be closed.

[netlify[bot]]

✅ Deploy Preview for bitbytesummerofcode ready!

Name	Link
🔨 Latest commit	7fff3d4fb9cd66aeac0bbe66a4005581a314fe57
🔍 Latest deploy log	https://app.netlify.com/sites/bitbytesummerofcode/deploys/6489ad07b352a700081055b8
😎 Deploy Preview	https://deploy-preview-42--bitbytesummerofcode.netlify.app/
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site settings.