Code Refactor Prompt

Refactor the code below.
Language/framework: {{language/framework}}
Constraints: {{constraints, e.g. no API changes, no new dependencies}}
Code:
```
{{code}}
```

Requirements:
1. Describe current behavior and risks first.
2. Give three to five refactor steps, each leaving the code runnable.
3. For each step, explain what changed, why and how to verify.
4. Do not change the public API or external behavior.
5. End with the full refactored code and test suggestions.