codestyle - remove trailing whitespaces

Structural/Adapter/Book.php

@@ -12,7 +12,6 @@ class Book implements PaperBookInterface
      */
     public function open()
     {
-
     }
 
     /**
@@ -20,6 +19,5 @@ class Book implements PaperBookInterface
      */
     public function turnPage()
     {
-
     }
 }

Structural/Adapter/EBookAdapter.php

@@ -4,7 +4,7 @@ namespace DesignPatterns\Structural\Adapter;
 
 /**
  * EBookAdapter is an adapter to fit an e-book like a paper book
- * 
+ *
  * This is the adapter here. Notice it implements PaperBookInterface,
  * therefore you don't have to change the code of the client which using paper book.
  */

Structural/Adapter/Kindle.php

@@ -12,7 +12,6 @@ class Kindle implements EBookInterface
      */
     public function pressNext()
     {
-
     }
 
     /**
@@ -20,6 +19,5 @@ class Kindle implements EBookInterface
      */
     public function pressStart()
     {
-
     }
 }