public function delete () {

        if( isset($_POST) && !empty($_POST) ) {

            $Validator = new Validator;
            $Validator->validation_rules(array(
                    'id'    => 'required|numeric',
            ));

            $validated = $Validator->run($_POST, true);
            if($validated === false) {
                    echo helperModel::toJson(
                    array(
                        'success'=>0,
                        'message'=>$Validator->get_readable_errors(true)
                    ));
            } else {
                $delete_contact = (new contactModel)->delete($validated['id']);
                if($delete_contact){
                    echo helperModel::toJson(array('success'=>1));
                }
            }
        }

    }