import typing


def ark(row: typing.Mapping[str, str]) -> str:
    """The item ARK (Archival Resource Key)

    Args:
        row: An input CSV record.

    Returns:
        The item ARK.
    """
    ark_prefix = "ark:/"
    if row["Item ARK"].startswith(ark_prefix, 0):
        return row["Item ARK"]
    return ark_prefix + row["Item ARK"]