def unquote(string: str) ->str:
    """
    Remove simple quote or double quote around a string if any.
    >>> unquote('"hello"')
    'hello'
    >>> unquote('"hello')
    '"hello'
    >>> unquote('"a"')
    'a'
    >>> unquote('""')
    ''
    """
    if len(string) >= 2 and (string.startswith('"') and string.endswith('"')
        ) or string.startswith("'") and string.endswith("'"):
        return string[1:-1]
    return string
