Getting category URL with hyphens, not spaces

So, I am using this to get the URL:

<a href="/category/<?php foreach((get_the_category()) as $category) { echo $category->cat_name . ' '; } ?>">

Which is outputting:

http://ift.tt/15QSrDw

instead of:

http://ift.tt/15LRk6X

How can I make it do the latter?

Much thanks.