"""
Hello module - provides greeting functionality
"""


def greet(name="World"):
    """
    Greet someone with a friendly message.
    
    Args:
        name (str): The name of the person to greet. Defaults to "World".
    
    Returns:
        str: A greeting message.
    """
    return f"Hello, {name}!"


def say_goodbye(name="World"):
    """
    Say goodbye to someone.
    
    Args:
        name (str): The name of the person to say goodbye to. Defaults to "World".
    
    Returns:
        str: A goodbye message.
    """
    return f"Goodbye, {name}!"
