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

// Copyright © 2018 Inanc Gumus
// Learn Go Programming Course
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
//
// For more tutorials  : https://learngoprogramming.com
// In-person training  : https://www.linkedin.com/in/inancgumus/
// Follow me on twitter: https://twitter.com/inancgumus

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
	}
}