add: numbers and strings exercises

08-numbers-and-strings/02-strings/exercises/05-improved-banger/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"
+)
+
+// ---------------------------------------------------------
+// EXERCISE: Improved Banger
+//
+//  Change the Banger program the work with Unicode
+//  characters.
+//
+// INPUT
+//  "İNANÇ"
+//
+// EXPECTED OUTPUT
+//  İNANÇ!!!!!
+// ---------------------------------------------------------
+
+func main() {
+	msg := os.Args[1]
+
+	s := msg + strings.Repeat("!", len(msg))
+
+	fmt.Println(s)
+}

08-numbers-and-strings/02-strings/exercises/05-improved-banger/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"
+	"unicode/utf8"
+)
+
+func main() {
+	msg := os.Args[1]
+	l := utf8.RuneCountInString(msg)
+
+	s := msg + strings.Repeat("!", l)
+
+	fmt.Println(s)
+}