Even if there's a single CC, a user may still want to keep 0 (who knows why, but that's not the question). Also, if number_to_keep == number_of_CCs, you can also exit early.
Even if there's a single CC, a user may still want to keep 0 (who knows why, but that's not the question). Also, if number_to_keep == number_of_CCs, you can also exit early.