funcsAO.go
func Letters(s string) []string {
	result := []string{}
	for _, r := range s {
		result = append(result, string(r))
	}
	return result
}
func Letters(s string) []string {
	result := []string{}
	for _, r := range s {
		result = append(result, string(r))
	}
	return result
}
// Letters returns an array of runes as strings so it can be indexed into.