$22\mathrm{.}1)$ Print greeting

Write a function print$\_$greeting that consumes a name $($as a string value$)$ and

prints out Hello X$,$ where X is the given name. So for example, if the name

"Bruce Wayne" was passed in$,$ the function should print Hello Bruce Wayne.

Write at least one unit test, but consider carefully what the function should

return; you should not explicitly be returning anything $-$ so what is returned by

default?