"""Utility functions for working with HTML."""


def wrap_tag(tag: str, string: str) -> str:
    """Wrap a string in an HTML tag.

    Args:
        tag: The tag to wrap the string in.
        string: The string to wrap.

    Returns:
        The string wrapped in the tag.

    Example:
        >>> wrap_tag("b", "Hello, world!")
        "<b>Hello, world!</b>"
    """
    tag_lower = tag.lower()
    return f"<{tag_lower}>{string}</{tag_lower}>"


def bold(string: str) -> str:
    """Wrap a string in a bold tag.

    Args:
        string: The string to wrap in bold.

    Returns:
        The string wrapped in a bold tag.

    Example:
        >>> bold("Hello, world!")
        "<b>Hello, world!</b>"
    """
    return wrap_tag("b", string)