def hello_world():
    """Return a simple greeting message."""
    return "Hello, World!"

def add_numbers(a, b):
    """Add two numbers and return the result."""
    return a + b

def main():
    """Main function to demonstrate the module."""
    print(hello_world())
    print(f"2 + 3 = {add_numbers(2, 3)}")

if __name__ == "__main__":
    main()