Conflict between namespace psr-4 prefix and target directory structure

[gmanen]

Steps to reproduce:

• Create a symfony project and leave App\ as a psr-4 prefix
• Create a controller with make:controller App\MyController

Expected behaviour:

• Generated class named MyController
• Generated namespace App\Controller\App\MyController
• Generated file src/Controller/App/MyController.php

Actual result:

• Generated class named MyController
• Generated namespace App\Controller\App\MyController
• Generated file src/Controller/MyController.php

This is because when generating the file path, the psr-4 prefix is replaced in all of the path string like so (Symfony\Bundle\MakerBundle\Util\AutoloaderUtil::getPathForFutureClass()):
str_replace($prefix, '', $className)

If at any point in your directory structure, a directory is named exactly as your psr-4 prefix, it will be removed from the file path.

A simple fix would be to only remove the prefix at the begining of the string. Suggested implementation would be:
substr($className, strlen($prefix))