func SliceF(start, end int) func(string) string {
	return func(s string) string {
		return Slice(s, start, end)
	}
}
func SliceF(start, end int) func(string) string {
	return func(s string) string {
		return Slice(s, start, end)
	}
}
// SliceF is the filter for Slice.