add: new input scanning exercises

23-input-scanning/exercises/05-quit/solution/main.go

@@ -0,0 +1,30 @@
+// 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 (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+)
+
+func main() {
+	in := bufio.NewScanner(os.Stdin)
+
+	words := make(map[string]bool)
+	for in.Scan() {
+		w := strings.ToLower(in.Text())
+
+		if words[w] {
+			fmt.Println("TWICE!")
+			return
+		}
+		words[in.Text()] = true
+	}
+}