refactor: extract lang check to greetingPrefix()

learn-with-go-tests/hello/hello.go

@@ -17,17 +17,20 @@ func Hello(name string, language string) string {
 		name = "World"
 	}
 
-	prefix := englishHelloPrefix
+	return greetingPrefix(language) + name
+}
 
+func greetingPrefix(language string) (prefix string) {
 	switch language {
 	case slovak:
 		prefix = slovakHelloPrefix
-
 	case french:
 		prefix = frenchHelloPrefix
+	default:
+		prefix = englishHelloPrefix
 	}
 
-	return prefix + name
+	return
 }
 
 func main() {