Hi,

What David mentioned in his response is the best way to remove the /category/ from the URL.  However, based on your comment, you can't remove the /category/ because it conflicts with the page URLs which kind of contradict your initial question.

I would suggest reworking on the page URL and the category URL.  If you use 301 redirect to redirect the old URL to the new URL, everything should be fine once Google crawls your site again and see the redirect.