Write a C function that prints out "Hello World!

$".$ Your function doesn't get any input parameters and doesn't return any values. Choose a reasonable identifier for your function.

$2.$ Write another C function that prints out "Goodbye World!

$".$ Your function doesn't get any input parameters and doesn't return any values. Choose a reasonable identifier for your function.

$3.$ Write a main function that

first, calls the first function,

second, calls the second function

and finally returns $0.$