Refactor linked list and improve array addition logic

[VikasGwala]

Pull Request: Refactor linked list and improve array addition logic

Description

This pull request refactors the linked list implementation for better readability and maintainability while improving the array addition logic to make it more efficient and easier to understand. The functionality remains unchanged.

Changes Made

• Refactored linked list code to improve structure and readability.
• Improved variable naming and code organization.
• Removed redundant or unnecessary code where applicable.

Reason

These changes make the code easier to read, maintain, and extend while preserving the existing behavior.

Testing

• Verified that linked list operations work as expected.
• Tested array addition with multiple input cases.
• Confirmed that existing functionality remains unchanged.

Type of Change

• Refactoring
• Code improvement
• Bug fix
• New feature
• Documentation update
• Breaking change

Checklist

• Code follows the project's coding standards.
• Existing functionality is preserved.
• Tested with different input scenarios.
• No unnecessary code or warnings introduced.