Combine the WordPress code properly [UPD]

Hello everyone. It is necessary to combine the code from functions.php into the plugin file without using AI, using

class Name {
  public function name() {};
}

It should be done in such a way that each function works (everything is working now), there may be some code duplication, it can be combined (if desired).

The number of lines of code in functions.php: 581 (including comments and structuring).
The number of lines of code in plugin.php: 478 (including comments and structuring).

It needs to be done in an hour, a maximum of two, as I currently do not have time to do all this.