Refactor the specified code to improve quality and maintainability. Focus on:

1. **Code Structure**
   - Extract complex methods/functions
   - Reduce function/method length
   - Separate concerns appropriately
   - Apply SOLID principles

2. **Code Quality**
   - Remove code duplication (DRY)
   - Improve naming for clarity
   - Simplify complex conditionals
   - Replace magic numbers with constants

3. **Design Patterns**
   - Identify applicable design patterns
   - Suggest pattern implementations
   - Improve abstraction levels

4. **Maintainability**
   - Reduce cyclomatic complexity
   - Improve testability
   - Enhance readability
   - Add appropriate comments for complex logic

5. **Backward Compatibility**
   - Ensure existing functionality is preserved
   - Maintain existing test coverage
   - Document any breaking changes

Provide before/after code examples with clear explanations of the improvements and their benefits.