func isFlag(s string) bool {
	return strings.HasPrefix(s, "-") && strings.TrimLeft(s, "-") != ""
}
func isFlag(s string) bool {
	return strings.HasPrefix(s, "-") && strings.TrimLeft(s, "-") != ""
}
func isFlag ( s string ) bool { return strings . HasPrefix ( s , " " ) && strings . TrimLeft ( s , " " ) != " " }
// isFlag returns true if a token is a flag such as "-v" or "--user" but not "-" or "--"
isFlag returns true if a token is a flag such as - v or -- user but not - or --