$40\mathrm{.}8$ LAB: Number pattern

Write a recursive function called print$\_$num$\_$pattern$()$ to output the following number pattern.

Given a positive integer as input $($Ex: $12),$ subtract another positive integer $($Ex: $3)$ continually until $0$ or a negative value is reached, and then

continually add the second integer until the first integer is again reached. For this lab, do not end output with a newline.

Ex$.$ If the input is:

$12$

$3$

the output is:

$12,9,6,3,0,3,6,9,12$