def bold(s: str) -> str:
    return f"<b>{s}</b>"

def italic(s: str) -> str:
    return f"<i>{s}</i>"

def strikethrough(s: str) -> str:
    return f"<s>{s}</s>"

def hyperlink(s: str, href: str) -> str:
    return f"<a href='{href}'>{s}</a>"

def code(s: str) -> str:
    return f"<code>{s}</code>"