add: numbers and strings exercises

08-numbers-and-strings/02-strings/exercises/06-tolowercase/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: ToLowercase
+//
+//  1. Look at the documentation of strings package
+//  2. Find a function that changes the letters into lowercase
+//  3. Get a value from the command-line
+//  4. Print the given value in lowercase letters
+//
+// HINT
+//  Check out the strings package from Go online documentation.
+//  You will find the lowercase function there.
+//
+// INPUT
+//  "SHEPARD"
+//
+// EXPECTED OUTPUT
+//  shepard
+// ---------------------------------------------------------
+
+func main() {
+}

08-numbers-and-strings/02-strings/exercises/06-tolowercase/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
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+func main() {
+	fmt.Println(strings.ToLower(os.Args[1]))
+}