n := 0
	for i := 0; i < length; i++ {
		n += len(ss[i])
	}
	b := make([]byte, 0, n)
	for i := 0; i < length; i++ {
		b = append(b, ss[i]...)
	}
	return unsafe.String(unsafe.SliceData(b), n)
}

// pathJoin - like path.Join() but retains trailing SlashSeparator of the last element
func pathJoin(elem ...string) string {
	sb := bytebufferpool.Get()
	defer func() {
		sb.Reset()