funcsPZ.go
func PadF(c string, n int) func(string) string {
	return func(s string) string {
		return Pad(s, c, n)
	}
}
func PadF(c string, n int) func(string) string {
	return func(s string) string {
		return Pad(s, c, n)
	}
}
// PadF is the filter form of Pad.