Use folder references for all groups and sort files/folders

passKit/Extensions/String+Localization.swift

@@ -1,5 +1,5 @@
 /*
- String.swift
+ String+Localization.swift
  passKit
 
  Created by Danny Moesch on 12.01.19.

passKit/Extensions/String+Utilities.swift

@@ -1,20 +1,17 @@
 //
-//  StringExtension.swift
+//  String+Utilities.swift
 //  passKit
 //
 //  Created by Yishi Lin on 2018/9/23.
 //  Copyright © 2018 Bob Sun. All rights reserved.
 //
 
-import Foundation
-
-public extension String {
-
-    var trimmed: String {
+extension String {
+    public var trimmed: String {
         return trimmingCharacters(in: .whitespacesAndNewlines)
     }
 
-    func stringByAddingPercentEncodingForRFC3986() -> String? {
+    public func stringByAddingPercentEncodingForRFC3986() -> String? {
         let unreserved = "-._~/?"
         var allowed = CharacterSet.alphanumerics
         allowed.insert(charactersIn: unreserved)

passKit/Extensions/UITextFieldExtension.swift

@@ -1,5 +1,5 @@
 //
-//  UIViewControllerExtionsion.swift
+//  UITextFieldExtension.swift
 //  pass
 //
 //  Created by Yishi Lin on 5/4/17.
@@ -21,14 +21,3 @@ extension UITextField {
         }
     }
 }
-
-extension UIViewController {
-    @objc public func textFieldShouldReturn(_ textField: UITextField) -> Bool {
-        if textField.nextField != nil {
-            textField.nextField?.becomeFirstResponder()
-        } else {
-            textField.resignFirstResponder()
-        }
-        return true
-    }
-}

passKit/Extensions/UIViewControllerExtension.swift

@@ -0,0 +1,18 @@
+//
+//  UIViewControllerExtension.swift
+//  pass
+//
+//  Created by Yishi Lin on 5/4/17.
+//  Copyright © 2017 Yishi Lin. All rights reserved.
+//
+
+extension UIViewController {
+    @objc public func textFieldShouldReturn(_ textField: UITextField) -> Bool {
+        if textField.nextField != nil {
+            textField.nextField?.becomeFirstResponder()
+        } else {
+            textField.resignFirstResponder()
+        }
+        return true
+    }
+}