//tell if a string contians a specified rune, utf8 friendly
tell if a string contians a specified rune, utf8 friendly
// tell if a string contians a specified rune utf8 friendly
func contains(letters []rune, letter rune) bool {
	for _, current := range letters {
		if current == letter {
			return true
		}
	}
	return false
}
func contains ( letters [ ] rune , letter rune ) bool { for _ , current := range letters { if current == letter { return true } } return false }
tell if a string contians a specified rune, utf8 friendly
tell if a string contians a specified rune utf8 friendly