const main: function = (input: string): string {
  if (input == "hello") {
	const bye: string = "bye"
    return input + " " + bye
  }

  return input
}

const main2: function = (input: string): string {
  const bye: string = main(input = "bye")

  return input + main(input = "hello")
}

main(input = "hello") => main2(input = $ + " ")