func detachPolicyFromUser(conn *iam.IAM, user string, arn string) error {
	_, err := conn.DetachUserPolicy(&iam.DetachUserPolicyInput{
		UserName:  aws.String(user),
		PolicyArn: aws.String(arn),
	})
	if err != nil {
		return err
	}
	return nil
}
func detachPolicyFromUsers(conn *iam.IAM, users []*string, arn string) error {
	for _, u := range users {
		_, err := conn.DetachUserPolicy(&iam.DetachUserPolicyInput{
			UserName:  u,
			PolicyArn: aws.String(arn),
		})
		if err != nil {
			return err
		}
	}
	return nil
}