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

Just as each line of code is as essential as a brick in a building, clumsy code may lead to 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 using Go:

• Code Smells: Indicators that our code needs refactoring, akin to clutter calling for cleanup.
• Refactoring Techniques: We've familiarized ourselves with Extract Function, Rename Function, and Substitute Algorithm techniques in earlier lessons.
• Go's Structs and Interfaces: We leverage structs for data organization and interfaces for defining behaviors, enabling cleaner and more maintainable code.
• Code Decoupling and Modularization: Techniques to organize code effectively, minimizing dependencies and coupling, making the code easier to manage.

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

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