Magento Get Category URL in Index Controller - php

Question

I am having troubles getting my redirectURL to grab the current URL inside of my IndexController. I have written something very similar that grabs the current product URL, but this is for the category. Can someone explain what I may have done wrong?
<?php
class Magestore_Categoryinquiry_IndexController extends Mage_Core_Controller_Front_Action
{
public function indexAction()
{
$this->_initLayoutMessages('catalog/session');
$this->loadLayout();
$this->renderLayout();
}
public function submitAction() {
$data = $this->getRequest()->getPost();
$error = false;
if($data) {
$category = Mage::getModel('catalog/category')->load($data['category_id']);
try {
$postObject = new Varien_Object();
$postObject->setData($data);
$error = false;
if (Mage::helper('categoryinquiry')->isRequireFname()) {
if (!Zend_Validate::is(trim($data['fname']) , 'NotEmpty')) {
$error = true;
}
}
if (Mage::helper('categoryinquiry')->isRequireLname()) {
if (!Zend_Validate::is(trim($data['lname']) , 'NotEmpty')) {
$error = true;
}
}
if (Mage::helper('categoryinquiry')->isRequireEmail()) {
if (!Zend_Validate::is(trim($data['customer_email']), 'EmailAddress')) {
$error = true;
}
}
if (Zend_Validate::is(trim($data['hideit']), 'NotEmpty')) {
$error = true;
}
if ($error) {
throw new Exception();
}
$model = Mage::getModel('categoryinquiry/categoryinquiry');
$data['store_id'] = Mage::app()->getStore()->getId();
$data['status'] = 1;
$data['created_time'] = now();
$data['updated_time'] = now();
$data['category_name'] = $category->getName();
$categoryinquiry = $this->getLayout()->createBlock('categoryinquiry/sendtocustomer')
->setInformation($data)
->setTemplate('categoryinquiry/email/sendtocustomer.phtml')
->toHtml();
$customercontact = $this->getLayout()->createBlock('categoryinquiry/sendtoadmin')
->setInformation($data)
->setTemplate('categoryinquiry/email/sendtoadmin.phtml')
->toHtml();
$model->setData($data)->save()
->sendMailToCustomer($model, $categoryinquiry)
->sendMailToAdmin($model, $customercontact)
;
Mage::getSingleton('catalog/session')->addSuccess(Mage::helper('categoryinquiry')->getSuccessMessage());
$this->_redirectUrl($category->getCategoryUrl());
return;
} catch (Exception $e) {
Mage::getSingleton('catalog/session')->addError(Mage::helper('categoryinquiry')->getErrorMessage());
$this->_redirectUrl($category->getCategoryUrl());
return;
}
}
}
}