Define the function print$\_$greeting to take two arguments: user$\_$name and time$\_$of$\_$day, that prints out a greeting.

For instance, if the function is called by the line

print$\_$greeting$("$Jeff$",$ "morning"$)$

The program will output

Good morning Jeff!

If the function is called with

print$\_$greeting$("$Ted$",$ "afternoon"$)$

The program will output

Good afternoon Ted!