Welcome to our captivating session on refactoring, a powerful tool for tidying up code, much like you would organize a messy toy box or find a faster route to school.

Each line of code is as essential as a brick in a building; clumsy code may result in an unstable structure. Today, we'll focus on enhancing the readability, maintainability, and performance of our code through refactoring.

Let's briefly revisit a few key concepts:

• Code Smells: Indicators that our code needs refactoring, akin to clutter calling for cleanup.
• Refactoring Techniques: We've familiarized ourselves with Extract Method, Rename Method, and Substitute Algorithm techniques in earlier lessons.
• OOP in Refactoring: We've learned how to leverage Object-Oriented Programming principles to enhance our code's structure.
• Code Decoupling and Modularization: Methods to make code easier to manage by minimizing dependencies.

We'll use these concepts as guiding stars as we traverse the cosmos of refactoring.

We'll start with rewriting a complex game score computation function. Let's look at it: