Move string coder protocols into the same file

Sources/SwiftKit/Data/StringCoder.swift

@@ -13,3 +13,27 @@ import Foundation
  and decode strings.
  */
 public protocol StringCoder: StringEncoder, StringDecoder {}
+
+/**
+ This protocol can be implemented by classes that can decode
+ strings.
+ */
+public protocol StringDecoder: AnyObject {
+
+    /**
+     Decode a string to another string.
+     */
+    func decode(_ string: String) -> String?
+}
+
+/**
+ This protocol can be implemented by classes that can encode
+ strings.
+ */
+public protocol StringEncoder: AnyObject {
+
+    /**
+     Encode a string to something else.
+    */
+    func encode(_ string: String) -> String?
+}

Sources/SwiftKit/Data/StringDecoder.swift

@@ -1,21 +0,0 @@
-//
-//  StringDecoder.swift
-//  SwiftKit
-//
-//  Created by Daniel Saidi on 2015-03-21.
-//  Copyright © 2020 Daniel Saidi. All rights reserved.
-//
-
-import Foundation
-
-/**
- This protocol can be implemented by classes that can decode
- strings.
- */
-public protocol StringDecoder: AnyObject {
-    
-    /**
-     Decode a string to another string.
-     */
-    func decode(_ string: String) -> String?
-}

Sources/SwiftKit/Data/StringEncoder.swift

@@ -1,21 +0,0 @@
-//
-//  StringEncoder.swift
-//  SwiftKit
-//
-//  Created by Daniel Saidi on 2015-03-21.
-//  Copyright © 2020 Daniel Saidi. All rights reserved.
-//
-
-import Foundation
-
-/**
- This protocol can be implemented by classes that can encode
- strings.
- */
-public protocol StringEncoder: AnyObject {
-    
-    /**
-     Encode a string to something else.
-    */
-    func encode(_ string: String) -> String?
-}