Retrieve 404 for the URL specified in module.routing.yml

I am new to Drupal and I have stuck with the problem that I do not know how to debug:
I have a simple module & # 39; final & # 39; created, whose structure:

Applications / MAMP / htdocs / drupal_dir_1 / modules / final> ls
final.info.yml final.routing.yml src

/ Applications / MAMP / htdocs / drupal_dir_1 / modules / final> ls src / Controller /
ExampleController.php

Files content:

> cat final.info.yml
Name: Finale
Type: Module
Description: This is a completion module
Core: 8.x⏎

> cat final.routing.yml
final content:
Path: & # 39; / final & # 39;
Default settings:
_controller: & # 39;  Drupal  final  Controller  ExampleController :: content & # 39;
_title: "Hello world bitch!"
Conditions:
_permission: & # 39; access content & # 39;

> cat src / Controller / ExampleController.php
 $ this-> t (Hello World, Slut! & # 39;),
];
return $ build;

}
}