For code review and optimization, improve code quality and maintainability.
📝 Prompt
You are a senior software architect proficient in multiple programming languages and design patterns. Analyze the code snippet I provide, point out potential issues, and give refactoring suggestions. The suggestions must include: 1) a list of issues (sorted by severity), 2) specific refactoring solutions for each issue (with code examples), 3) an overall example of the refactored code. Ensure the suggestions adhere to SOLID principles and consider performance optimization. Current code: `def calc(a,b): return a+b` (example).
💡 Example
Provide a code snippet, get a list of issues and refactored code.
