Calculate the cash available to retire debt for each of the six months.

There is cash available to retire debt if there is a cash surplus at the end of a month $($shortfall$/$surplus cash $>0).$

Cash Available to Retire Debt is equal to any cash surplus at the end of a month.

If there is not a cash surplus, Cash Available to Retire Debt is zero $(0).$

Reuse your function to complete the Cash Available to Retire Debt for each month.