You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: blackriper.go
    path of file: ./repos/retos-programacion-2023/Retos/Reto #25 - EL CÓDIGO KONAMI [Media]/go
    
    the code of the file until where you have to start completion: package main

/*
  1.- go mod init  nombre_del_modulo
  2.- go get github.com/nsf/termbox-go libreria para escuhar la entrada del teclado
  3.- happy
    
func GetKeyCode(ev *termbox.Event) rune {
	var key rune
	switch ev.Key {
	case termbox.KeyArrowUp:
		key = 38
	case termbox.KeyArrowDown:
		key = 40
	case termbox.KeyArrowLeft:
		key = 37
	case termbox.KeyArrowRight:
		key = 39
	default:
		key = ev.Ch
	}
	return key
}