Each class must be in a file by itself

A file should declare new symbols (classes, functions, constants, etc.) and cause no other side effects, or it should execute logic with side effects, but should not do both. The first symbol is defined on line 14 and the first side effect is on line 11.

Duplicate class name "CustomGento\DefaultStoreCodeRemover\Helper\StoreUrl" found; first defined in /github/workspace/Helper/StoreUrl.php on line 14