LLM Evaluation

# Test Task with Multiple Test Files

Create a simple calculator script that supports basic operations.

## Requirements

1. Create a file `calculator.py` that:
- Has a function `add(a, b)` that returns a + b
- Has a function `subtract(a, b)` that returns a - b
- Has a function `multiply(a, b)` that returns a * b
- Has a function `divide(a, b)` that returns a / b (handle division by zero)

2. Create a file `main.py` that:
- Imports the calculator module
- Prints "Calculator ready!"

Make sure all functions work correctly.

PS: You are currently working in an automated system and cannot ask any question or have back and forth with an user.