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: api_op_CancelMaintenanceWindowExecution.go
    path of file: ./repos/teller/vendor/github.com/aws/aws-sdk-go-v2/service/ssm
    
    the code of the file until where you have to start completion: // Code generated by smithy-go-codegen DO NOT EDIT.

package ssm

import (
	"context"
	"fmt"
	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
	"github.com/aws/aws-sdk-go-v2/aws/signer/v4"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
)

// Stops a maintenance window execution that is already in progress and cancels
// any tasks in the window that haven't already starting running. Tasks already in
// progress will continue to completion.
func (c *Client) CancelMaintenanceWindowExecution(ctx context.Context, params *CancelMaintenanceWindowExecutionInput, optFns ...func(*Options)) (*CancelMaintenanceWindowExecutionOutput, error) {
	if params == nil {
		params = &CancelMaintenanceWindowExecutionInput{}
	}

	result, metadata, err := c.invokeOperation(ctx, "CancelMaintenanceWindowExecution", params, optFns, c.addOperationCancelMaintenanceWindowExecutionMiddlewares)
	if err != nil {
		return nil, err
	}

	out := result.(*CancelMaintenanceWindowExecutionOutput)
	out.ResultMetadata = metadata
	return out, nil
}

type CancelMaintenanceWindowExecutionInput struct {

	// The ID of the maintenance window execution to stop.
	//
	// This member is required.
	WindowExecutionId *string

	noSmithyDocumentSerde
}

type CancelMaintenanceWindowExecutionOutput struct {

	// The ID of the maintenance window execution that has been stopped.
	WindowExecutionId *string

	// Metadata pertaining to the operation's result.
	ResultMetadata middleware.Metadata


    
func (c *Client) addOperationCancelMaintenanceWindowExecutionMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsAwsjson11_serializeOpCancelMaintenanceWindowExecution{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsjson11_deserializeOpCancelMaintenanceWindowExecution{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "CancelMaintenanceWindowExecution"); err != nil {
		return fmt.Errorf("add protocol finalizers: %v", err)
	}

	if err = addlegacyEndpointContextSetter(stack, options); err != nil {
		return err
	}
	if err = addSetLoggerMiddleware(stack, options); err != nil {
		return err
	}
	if err = awsmiddleware.AddClientRequestIDMiddleware(stack); err != nil {
		return err
	}
	if err = smithyhttp.AddComputeContentLengthMiddleware(stack); err != nil {
		return err
	}
	if err = addResolveEndpointMiddleware(stack, options); err != nil {
		return err
	}
	if err = v4.AddComputePayloadSHA256Middleware(stack); err != nil {
		return err
	}
	if err = addRetryMiddlewares(stack, options); err != nil {
		return err
	}
	if err = awsmiddleware.AddRawResponseToMetadata(stack); err != nil {
		return err
	}
	if err = awsmiddleware.AddRecordResponseTiming(stack); err != nil {
		return err
	}
	if err = addClientUserAgent(stack, options); err != nil {
		return err
	}
	if err = smithyhttp.AddErrorCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = smithyhttp.AddCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = addSetLegacyContextSigningOptionsMiddleware(stack); err != nil {
		return err
	}
	if err = addOpCancelMaintenanceWindowExecutionValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opCancelMaintenanceWindowExecution(options.Region), middleware.Before); err != nil {
		return err
	}
	if err = awsmiddleware.AddRecursionDetection(stack); err != nil {
		return err
	}
	if err = addRequestIDRetrieverMiddleware(stack); err != nil {
		return err
	}
	if err = addResponseErrorMiddleware(stack); err != nil {
		return err
	}
	if err = addRequestResponseLogging(stack, options); err != nil {
		return err
	}
	if err = addDisableHTTPSMiddleware(stack, options); err != nil {
		return err
	}
	return nil
}