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: kms_create_key.go
    path of file: ./repos/aws-doc-sdk-examples/go/example_code/kms
    
    the code of the file until where you have to start completion: // Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0

package main

import (
	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/aws/session"
	"github.com/aws/aws-sdk-go/service/kms"

	"fmt"
	"os"
)

// Create an AWS KMS key (KMS key)
// Since we are only encrypting small amounts of data (4 KiB or less) directly,
// a KMS key is fine for our purposes.
// For larger amounts of data,
// use the KMS key to encrypt 
    
func main() {
	// Initialize a session in us-west-2 that the SDK will use to load
	// credentials from the shared credentials file ~/.aws/credentials.
	sess, err := session.NewSession(&aws.Config{
		Region: aws.String("us-west-2")},
	)

	// Create KMS service client
	svc := kms.New(sess)

	// Create the key
	result, err := svc.CreateKey(&kms.CreateKeyInput{
		Tags: []*kms.Tag{
			{
				TagKey:   aws.String("CreatedBy"),
				TagValue: aws.String("ExampleUser"),
			},
		},
	})

	if err != nil {
		fmt.Println("Got error creating key: ", err)
		os.Exit(1)
	}

	fmt.Println(*result.KeyMetadata.KeyId)
}