func cost(svc *awscf.CloudFormation, b []byte, params []*awscf.Parameter) {
estInput := &awscf.EstimateTemplateCostInput{
Parameters: params,
TemplateBody: aws.String(string(b)),
}
cost, err := svc.EstimateTemplateCost(estInput)
if err != nil {
log.Fatal(err)
}
fmt.Println(*cost.URL)
}