Countdown Inside A Function

Complete count_down(start: int) -> None so it prints every whole number from start down to 1, one per line, using a while loop that lowers the parameter by one each pass; a start of 0 or less prints nothing. The tests call the function and then print Done on its own line. Do NOT write a main block or any top-level test code; the tests construct the calls. Input: one line, an integer, which the tests read and pass to your function.