$($

$13$

$\%$

$)$

$$Write a function void under

$($

int s

$)$

$$that prints an "underwear" of size s

$.$

$$You

can assume that

$$

$$is even and

$$

$>=$

$4$

$.$

$$There shall be s rows of printings. The top and bottom

rows shall have

$2$

$\backslash$times

$$s and

$$

$\text{'}$

$*$

$*$

$\text{'}$

$$symbols respectively. The following shows some example

printing outputs for various function calls.

$($

You may use to denote a space in your answer

for clarity.

$)$