Refactor

Improve code structure without changing behavior.

Constraints

Actions

1. Break large functions into small, pure functions
2. Add type annotations (no Any, no interface{})
3. Rename variables descriptively (no x, data, temp)
4. Extract magic numbers to constants
5. Use modern language idioms (Python 3.12+, Go 1.22+, ESNext)

Output

Full refactored code only. No explanations.

For significant changes, add a comment header:

# Refactored:
# - Extracted validation logic
# - Added type hints
# - Renamed variables