Metadata Api Custom Object Create

MetadataApiCustomObjectCreate.apex

public without sharing class MetadataApiCustomObjectCreate {
   private static String getSoapBodyXml(String name) {
        return ''
            + '<?xml version="1.0" encoding="utf-8"?>'
            + '<env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">'
            + '<env:Header>'
            + '<urn:SessionHeader xmlns:urn="http://soap.sforce.com/2006/04/metadata">'
            + '<urn:sessionId>' +  UserInfo.getSessionId() + '</urn:sessionId>'
            + '</urn:SessionHeader>'
            + '</env:Header>'
            + '<env:Body>'
            + '<createMetadata xmlns="http://soap.sforce.com/2006/04/metadata">'
            + '<metadata xsi:type="CustomObject">'
            + '<label>' + name + '</label>'
            + '<pluralLabel>' + name +'s' + '</pluralLabel>'
            + '<fullName>' + name + '__c' + '</fullName>'
            + '<nameField><label>Name</label><type>Text</type></nameField>'
            + '<deploymentStatus>Deployed</deploymentStatus>'
            + '<sharingModel>ReadWrite</sharingModel>'
            + '</metadata>'
            + '</createMetadata>'
            + '</env:Body>'
            + '</env:Envelope>'
        ;
    }

    public static HttpResponse add(String name) {
        HttpRequest req = new HttpRequest();
        req.setEndpoint(URL.getOrgDomainUrl().toExternalForm() + '/services/Soap/m/50.0');
        req.setMethod('POST');
        req.setHeader('Content-Type', 'text/xml');
        req.setHeader('SOAPAction', '""');
        req.setBody(getSoapBodyXml(name));
        return new Http().send(req);
    }
}