Morning Session: Peer-to-Peer Code Review

# Highlights
Great job on the project. All the core functionality requirements have been met 💪 .
You can:
- Add a new item to the list.
- Delete an item from the list.
- Clear all completed tasks.
- Update existing tasks.

## Optional suggestions
- To improve the validation of new items, you can prevent the addition of duplicate etries.

Start by locating the entry point that adds new items to the task list and review how new-item validation currently works. The work is done when duplicate entries are rejected while the existing add, update, delete, and clear-completed behavior remains intact.

Written by the indexing model from the issue text.