refactor: 6th section first two lectures exercises and questions

06-variables/02-declarations/exercises/05-undeclarables/main.go

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+// 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
+
+// ---------------------------------------------------------
+// EXERCISE: Undeclarables
+//
+//  1. Declare the variables below:
+//      3speed
+//      !speed
+//      spe?ed
+//      var
+//      func
+//      package
+//
+//  2. Observe the error messages
+//
+// NOTE
+//  The types of the variables are not important.
+// ---------------------------------------------------------
+
+func main() {
+	// var ? int
+	// var ? int
+	// var ? int
+	// var ? int
+	// var ? int
+	// var ? int
+}

06-variables/02-declarations/exercises/05-undeclarables/solution/main.go

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+// 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
+
+func main() {
+	// var 3speed int
+	// var !speed int
+	// var spe?ed int
+	// var var int
+	// var func int
+	// var package int
+}