Feat/rotate linked list

[Shuklax]

This contribution includes:

Creating a new file rotate_linked_list.js in dsa/linkedlist/.
Implementing an optimized rotation algorithm using a circular connection and modular arithmetic.
Adding detailed comments, example usage, and a self-check in the console.

fixes #298

[github-actions]

🧩 PR Checklist

Hi @Shuklax, before merging please ensure:

• Updated contributor.md
• Added proper commit message
• Verified build/test success ✅

[github-actions]

⭐ Hey @Shuklax, if you like this project, don't forget to star the repository! 🚀

[Copilot]

Pull Request Overview

This PR introduces two new linked list manipulation algorithms: rotating a linked list to the right by k places and reordering a linked list by odd and even indices.

• Implements rotateRight function that rotates a linked list to the right by k positions using a circular linked list approach
• Implements oddEvenLinkedList function that groups nodes at odd indices together followed by nodes at even indices
• Both implementations include helper functions for printing lists and self-test code for browser environments

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
dsa_in_js/linkedlist/rotate_linked_list.js	Adds rotation algorithm with circular linking technique, including ListNode class, rotation logic, and test code
dsa_in_js/linkedlist/odd_even_linked_list.js	Adds odd-even reordering algorithm with two-pointer approach, including ListNode class, reordering logic, and test code

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.