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Rectangle Area Calculation

Write a Python function `rectangle_area(length, breadth)` that calculates and returns the area of a rectangle given its `length` and `breadth`.

#### Example Usage:
```python [main.nopy]
print(rectangle_area(10, 20))  # Output: 200
print(rectangle_area(4, 5))    # Output: 20
```

#### Constraints:
- Both `length` and `breadth` will be positive integers.
def rectangle_area(length, breadth):
    """
    Calculate the area of a rectangle given its length and breadth.

    Args:
        length (int): The length of the rectangle.
        breadth (int): The breadth of the rectangle.

    Returns:
        int: The area of the rectangle.
    """
    # TODO: Implement the function
    pass