Write multiply$\_$all$\_$values$()\text{'}$s recursive case to:

Output in$\_$value followed by $\text{'}*\text{'}$ in one line with end$=\text{'}\text{'}.$

Recursively call multiply$\_$all$\_$values$()$ with in$\_$value $-1.$

Return in$\_$value multiplied by the return value of the recursive call.