check the below code

**In controller:**

    <?php
    
    namespace Softadroit\Prescription\Controller\Index;
    
    class Save extends \Magento\Framework\App\Action\Action
    {
        protected $_pageFactory;
    
        public function __construct(
            \Magento\Framework\App\Action\Context $context,
            \Magento\Framework\Controller\Result\RedirectFactory $resultRedirectFactory,
            \Magento\Framework\View\Result\PageFactory $pageFactory,
            \Magento\Checkout\Model\CartFactory $cartFactory
        ) {
            $this->_pageFactory          = $pageFactory;
            $this->cartFactory           = $cartFactory;
            $this->resultRedirectFactory = $resultRedirectFactory;
    
            return parent::__construct($context);
        }
    
        public function execute()
        {
            $post = $this->getRequest()->getPost();
    
            /* echo "<pre>";
            print_r($post);
            die(); */
    
            if (!empty($post)) {
                foreach ($post['name'] as $key => $name) {
                    $age         = $post['age'][$key];
                    $weight      = $post['weight'][$key];
                    $height      = $post['height'][$key];
                    $gender      = $post['subject_gender'][$key];
                    $product_id  = $post['product_id'][$key];
                    $customer_id = $post['customer_id'][$key];
    
                    $model = $this->_objectManager->create('Softadroit\Prescription\Model\Prescription');
    
                    $model->setData([
                        "name"        => $name,
                        "age"         => $age,
                        "weight"      => $weight,
                        "height"      => $height,
                        "gender"      => $gender,
                        "product_id"  => $product_id,
                        "customer_id" => $customer_id,
                    ]);
    
                    $msg  = "";
                    $data = $model->save();
                    if ($data != '') {
    //$model->save();
                        $this->messageManager->addSuccessMessage('Thanks your form is submitted successfully!');
                    } else {
                        $this->messageManager->addSuccessMessage('Error in submitting data. Please contact on this email!');
                    }
                }
                echo $msg;
    
                $cartObject = $this->cartFactory->create()->truncate();
                $cartObject->saveQuote();
    
            }
    
            $resultRedirect = $this->resultRedirectFactory->create();
            $resultRedirect->setPath('prescription/index/success');
            return $resultRedirect;
        }
    }