longest := ""

	var longest string

			go pal_worker(str, k, results)

			go palWorker(str, k, results)

func pal_worker(str string, k int, result chan<- string) {
	longest := string(str[k])
	for i := 1; true; i++ {
		// avoid overrun or underrun
		if k-i < 0 || k+i > len(str)-1 {
			break
		}
		// two identical bytes

func palWorker(str string, k int, result chan<- string) {
	var longest string
	for i := 1; k-i > -1 && k+i < len(str); i++ {

			longest = string(str[k-i]) + longest + string(str[k+i])

			longest = str[k-i : k+i+1]

	}
	//fmt.Fprintf(os.Stderr, "Worker(%d) result: %s\n", k, longest)
	if len(longest) > 1 {
		result <- longest
	} else {
		result <- ""

	result <- longest