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

package iam

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

// Creates a new managed policy for your Amazon Web Services account. This
// operation creates a policy version with a version identifier of v1 and sets v1
// as the policy's default version. For more information about policy versions, see
// Versioning for managed policies (https://docs.aws.amazon.com/IAM/latest/UserGuide/policies-managed-versions.html)
// in the IAM User Guide. As a best practice, you can validate your IAM policies.
// To learn more, see Validating IAM policies (https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies_policy-validator.html)
// in the IAM User Guide. For more information about managed policies in general,
// see Managed policies and inline policies (https://docs.aws.amazon.com/IAM/latest/UserGuide/policies-managed-vs-inline.html)
// in the IAM User Guide.
func (c *Client) CreatePolicy(ctx context.Context, params *CreatePolicyInput, optFns ...func(*Options)) (*CreatePolicyOutput, error) {
	if params == nil {
		params = &CreatePolicyInput{}
	}

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

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

type CreatePolicyInput struct {

	// The JSON policy document that you want to use as the content for the new
	// policy. You must provide policies in JSON format
    
func (c *Client) addOperationCreatePolicyMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsAwsquery_serializeOpCreatePolicy{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsquery_deserializeOpCreatePolicy{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "CreatePolicy"); 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 = addOpCreatePolicyValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opCreatePolicy(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
}