Breadcrumbs links not showing correct url - codeigniter

Question

I am creating some bread crumbs for my folders. When I click on the 2nd bread crumb link it does not go to the correct URL
The previous URL shows "test"
http://localhost/project/admin/common/test?directory=test/sub
It should show
http://localhost/project/admin/common/test?directory=test
Inspector Output
<ul class="breadcrumb">
<li>Catalog</li>
<li>test</li>
<li>sub</li>
</ul>
On view
<ul class="breadcrumb">
<?php foreach ($breadcrumbs as $breadcrumb) { ?>
<li><?php echo $breadcrumb['text']; ?></li>
<?php } ?>
</ul>
Question: How can I make sure the previous URL to shows the before folder correct URL.
I generate my breadcrumbs on my controller
$data['breadcrumbs'] = array();
$data['breadcrumbs'][] = array(
'text' => 'Catalog',
'href' => base_url('admin/common/test')
);
$directory_names = explode('/', $this->input->get('directory'));
foreach ($directory_names as $directory_name) {
$data['breadcrumbs'][] = array(
'text' => $directory_name,
'href' => base_url('admin/common/test?directory=' . $this->input->get('directory'))
);
}

Answer 1

Thanks to a solution now I found on another forum I will post on here to share
https://forum.codeigniter.com/thread-68653-post-346110.html#pid346110
$directory_names = explode('/', $this->input->get('directory'));
$directory_done = '';
foreach ($directory_names as $directory_name) {
$directory_done .= ($directory_done <> ''? '/':'').$directory_name;
$data['breadcrumbs'][] = array(
'text' => $directory_name,
'href' => base_url('admin/common/test?directory=' . $directory_done)
);
}