Service for link reduction

The site is made according to the MVC scheme, so it can be easily modified and improved.
The PSR standards are met, the design patterns are used, which makes the entire code absolutely easy to read for any specialist.
Safe connection to the BD, registration/authorization system, checking all input data.
Of course, without a short address, the site has no meaning. It was made as a demonstration, but can be used in real conditions with a short domain.