Create custome field in salesforce through apex code

 @AuraEnabled(cacheable = true)

    public static void generateField( String label , String apiname ,String url , String sesId) {

        String metadata = '{"Metadata" : {"type" : "Text"'+

            ',"description" :"New Field From toolingApi"'+

            ', "inlineHelpText" : "","precision" : null,"label" : "'+label+'"'+

            ',"length" : 255,"required" : false},'+

            '"FullName" : "Account.'+apiname+'"}';

        String responseBody = createField(metadata,url,sesId);

    }

    

    public static String createField(String metadata,String url , String sesId) {

        System.debug('metadata : ' + metadata);

        System.debug('url : ' + url);

        System.debug('sessionId : ' + sesId);

        

        HttpRequest request = new HttpRequest();

        request.setHeader('Authorization', 'Bearer ' + sesId);

        request.setHeader('Content-Type', 'application/json');

        request.setEndpoint(url+'/services/data/v46.0/tooling/sobjects/CustomField');

        request.setMethod('POST'); 

        request.setBody(metadata);

        Http http = new Http();

        HTTPResponse res = http.send(request);

        System.debug('res: ' + res.getBody());

        System.debug('Status: ' + res.getStatusCode());

        if (res.getStatusCode() == 201) {

            System.debug('Custom field created successfully.');

        } else {

            System.debug('Custom field creation failed. Response: ' + res.getBody());

        }

        

        return '';        

    }

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