refactor: variables/assignment exercises and questions

06-variables/04-assignment/exercises/02-vars-to-vars/solution/main.go

@@ -0,0 +1,20 @@
+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import "fmt"
+
+func main() {
+	color := "green"
+
+	// `"dark " + color` is an expression
+
+	color = "dark " + color
+
+	fmt.Println(color)
+}