diff --git a/Math/Function/Fibunacci.php b/Math/Functions/Fibunacci.php
similarity index 100%
rename from Math/Function/Fibunacci.php
rename to Math/Functions/Fibunacci.php
diff --git a/Math/Function/Functions.php b/Math/Functions/Functions.php
similarity index 100%
rename from Math/Function/Functions.php
rename to Math/Functions/Functions.php
diff --git a/System/File/Directory.php b/System/File/Directory.php
index cbe1e7778..b08c3809f 100644
--- a/System/File/Directory.php
+++ b/System/File/Directory.php
@@ -288,14 +288,6 @@ class Directory extends FileAbstract implements \Iterator, \ArrayAccess
         return implode('/', $path);
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function removeNode() : bool
-    {
-        return true;
-    }
-
     /**
      * Remove by name.
      *
diff --git a/System/File/File.php b/System/File/File.php
index 9d0cff3c8..3d2e4732b 100644
--- a/System/File/File.php
+++ b/System/File/File.php
@@ -97,14 +97,6 @@ class File extends FileAbstract
         return false;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function removeNode() : bool
-    {
-        return true;
-    }
-
     /**
      * Get file content.
      *