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_CreateOrganizationalUnit.go
    path of file: ./repos/aws-sdk-go-v2/service/organizations
    
    the code of the file until where you have to start completion: // Code generated by smithy-go-codegen DO NOT EDIT.

package organizations

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

// Creates an organizational unit (OU) within a root or parent OU. An OU is a
// container for accounts that enables you to organize your accounts to apply
// policies according to your business requirements. The number of levels deep that
// you can nest OUs is dependent upon the policy types enabled for that root. For
// service control policies, the limit is five. For more information about OUs, see
// Managing organizational units (OUs) (https://docs.aws.amazon.com/organizations/latest/userguide/orgs_manage_ous.html)
// in the Organizations User Guide. If the request includes tags, then the
// requester must have the organizations:TagResource permission. This operation
// can be called only from the organization's management account.
func (c *Client) CreateOrganizationalUnit(ctx context.Context, params *CreateOrganizationalUnitInput, optFns ...func(*Options)) (*CreateOrganizationalUnitOutput, error) {
	if params == nil {
		params = &CreateOrganizationalUnitInput{}
	}

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

	out := result.(*CreateOrganizationalUnitOutput)
	out.ResultMetadata = metadat
    
func (c *Client) addOperationCreateOrganizationalUnitMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsAwsjson11_serializeOpCreateOrganizationalUnit{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsjson11_deserializeOpCreateOrganizationalUnit{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "CreateOrganizationalUnit"); 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 = addClientRequestID(stack); err != nil {
		return err
	}
	if err = addComputeContentLength(stack); err != nil {
		return err
	}
	if err = addResolveEndpointMiddleware(stack, options); err != nil {
		return err
	}
	if err = addComputePayloadSHA256(stack); err != nil {
		return err
	}
	if err = addRetry(stack, options); err != nil {
		return err
	}
	if err = addRawResponseToMetadata(stack); err != nil {
		return err
	}
	if err = 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 = addOpCreateOrganizationalUnitValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opCreateOrganizationalUnit(options.Region), middleware.Before); err != nil {
		return err
	}
	if err = 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
}