Printing gets a lot more useful once you can mix text that you wrote with values that your
program is holding.
When one side of + is a String, Kotlin joins the two together into a longer String, and you
can print the result.
Assuming a String variable named name has been declared and initialized, write a snippet of
code—not a function—that greets that person by name on a single line.
So if name were "Alex", you would print:
Hello, Alex!
Don't modify name.