You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: delete_security_marks.go
    path of file: ./repos/golang-samples/securitycenter/assets
    
    the code of the file until where you have to start completion: // Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package assets

// [START securitycenter_delete_security_marks]
import (
	"context"
	"fmt"
	"io"

	securitycenter "cloud.google.com/go/securitycenter/apiv1"
	"cloud.google.com/go/securitycenter/apiv1/securitycenterpb"
	"google.golang.org/genproto/protobuf/field_mask"
)

// deleteSecuri
    
func deleteSecurityMarks(w io.Writer, assetName string) error {
	// Specify the value of 'assetName' in one of the following formats:
	// 		assetName := "organizations/{org_id}/assets/{asset_id}"
	//		assetName := "projects/{project_id}/assets/{asset_id}"
	//		assetName := "folders/{folder_id}/assets/{asset_id}"
	// Instantiate a context and a security service client to make API calls.
	ctx := context.Background()
	client, err := securitycenter.NewClient(ctx)
	if err != nil {
		return fmt.Errorf("securitycenter.NewClient: %w", err)
	}
	defer client.Close() // Closing the client safely cleans up background resources.

	req := &securitycenterpb.UpdateSecurityMarksRequest{
		// If not set or empty, all marks would be cleared.
		UpdateMask: &field_mask.FieldMask{
			Paths: []string{"marks.key_a", "marks.key_b"},
		},
		SecurityMarks: &securitycenterpb.SecurityMarks{
			Name: fmt.Sprintf("%s/securityMarks", assetName),
			// Intentionally not setting marks with the
			// corresponding field mask deletes them.
		},
	}
	updatedMarks, err := client.UpdateSecurityMarks(ctx, req)
	if err != nil {
		return fmt.Errorf("UpdateSecurityMarks: %w", err)
	}

	fmt.Fprintf(w, "Updated marks: %s\n", updatedMarks.Name)
	for k, v := range updatedMarks.Marks {
		fmt.Fprintf(w, "%s = %s\n", k, v)
	}
	return nil
}