Seo Pro SLA cnc generation, removal of duplicate pages.

A unique extension
The name SEO PRO has been in the terminology of the OpenCart community for a long time.
This version has been tested for more than a year, and has been tested on more than one site.
It takes into account and corrects the shortcomings of the known module. But it also carries its benefits.
1. Uniqueness of all Url
2. Redirect to the original page, in case of erroneous external links
3. Ability to use CNC for specific pages
4. Correction of errors with negative values of LIMIT, PAGE
5. Work speed due to caching (it is possible to use this module for stores with a large number of products and categories by disabling caching)
6. When moving / changing the engine, it is possible to manage url prefixes, for example
yoursite/product/product
yoursite/catalog/category
7. It is possible for categories to get a short url, while the path in Breadcrumbs remains full, from the root category
8. It is possible to get CNC for pagination like yoursite/category/page-2
9. In case of using any news, blogs that have their own modifiers for generating CNC (seo url), these changes will be taken into account by the module.

At the moment, the extension has the Sla SEO PRO prefix, which emphasizes both inheritance and code modification.

One of the features of the SEO PRO module is the appearance in the product card of such an entity as the main (main category), from which the path for breadcrumbs on the product page is built.