Return: Quiz II in Go

Quiz: What would this code produce if we were to copy-paste it in a code editor and run it?

func getGreeting(name string) string {
    fmt.Println("Hey, " + name)
}

func mainFunction() {
    greeting := getGreeting("Andy")
    fmt.Println(greeting)
}

Important Note:

Do not use an actual code editor to get the answer. It would defeat the purpose of the quiz.