Restructured the hierarchy of the existing models based on the Amiibo API definitions.

Sources/Filters/AmiiboFilter.swift

@@ -107,14 +107,16 @@ extension AmiiboFilter: Filter {
 
 // MARK: - Enumerations
 
-/// This enumeration indicates if extra information for amiibos need to be retrieved.
-public enum ShowExtras {
+extension AmiiboFilter {
+    /// This enumeration indicates if extra information for amiibos need to be retrieved.
+    public enum ShowExtras {
         /// No extra information needs to be retrieved.
         case none
         /// Amiibo games information needs to be retrieved.
         case games
         /// Amiibo games and its usage information needs to be retrieved.
         case usage
+    }
 }
 
 // MARK: - String+Key

Sources/Models/AmiiboGame.swift

@@ -0,0 +1,27 @@
+extension Amiibo {
+    /// This model structs represents a game that is related to an amiibo, when requested to the respective [remote API endpoint](https://www.amiiboapi.com/docs/#showGames).
+    public struct Game {
+        
+        // MARK: Properties
+        
+        /// The list of identifiers associated to the game.
+        public let ids: [String]
+        
+        /// The name of the game.
+        public let name: String
+        
+        /// The list of usages that explains how the amiibo is being used in the game.
+        public let usage: [Usage]?
+        
+    }
+}
+
+// MARK: - Decodable
+
+extension Amiibo.Game: Decodable {
+    enum CodingKeys: String, CodingKey {
+        case ids = "gameID"
+        case name = "gameName"
+        case usage = "amiiboUsage"
+    }
+}

Sources/Models/AmiiboGameUsage.swift

@@ -0,0 +1,23 @@
+extension Amiibo.Game {
+    /// This model struct represents how an amiibo is used with a particular game, when requested to the respective [remote API endpoint](https://www.amiiboapi.com/docs/#showUsage).
+    public struct Usage {
+        
+        // MARK: Properties
+        
+        /// The explanation on how an amiibo is being used with a particular game.
+        public let explanation: String
+        
+        /// A flag that indicates whether an amiibo is only read-only or the game can also write information to the amiibo.
+        public let isWritable: Bool
+        
+    }
+}
+
+// MARK: - Decodable
+
+extension Amiibo.Game.Usage: Decodable {
+    enum CodingKeys: String, CodingKey {
+        case explanation = "Usage"
+        case isWritable = "write"
+    }
+}

Sources/Models/AmiiboRelease.swift

@@ -0,0 +1,33 @@
+import Foundation
+
+extension Amiibo {
+    /// This model struct represents a collection of official release dates (if released) of an amiibo in different markets around the world.
+    public struct Release {
+        
+        // MARK: Properties
+        
+        /// The official release date (if released) of an amiibo in Australia.
+        public let australia: Date?
+        
+        /// The official release date (if released) of an amiibo in Europe.
+        public let europe: Date?
+        
+        /// The official release date (if released) of an amiibo in Japan.
+        public let japan: Date?
+        
+        /// The official release date (if released) of an amiibo in North America.
+        public let america: Date?
+        
+    }
+}
+
+// MARK: - Decodable
+
+extension Amiibo.Release: Decodable {
+    enum CodingKeys: String, CodingKey {
+        case australia = "au"
+        case europe = "eu"
+        case japan = "jp"
+        case america = "na"
+    }
+}

Sources/Models/Game.swift

@@ -1,25 +0,0 @@
-/// This model structs represents a game that is related to an amiibo, when requested to the respective [remote API endpoint](https://www.amiiboapi.com/docs/#showGames).
-public struct Game {
-    
-    // MARK: Properties
-    
-    /// The list of identifiers associated to the game.
-    public let ids: [String]
-    
-    /// The name of the game.
-    public let name: String
-    
-    /// The list of usages that explains how the amiibo is being used in the game.
-    public let usage: [Usage]?
-
-}
-
-// MARK: - Decodable
-
-extension Game: Decodable {
-    enum CodingKeys: String, CodingKey {
-        case ids = "gameID"
-        case name = "gameName"
-        case usage = "amiiboUsage"
-    }
-}

Sources/Models/Release.swift

@@ -1,31 +0,0 @@
-import Foundation
-
-/// This model struct represents a collection of official release dates (if released) of an amiibo in different markets around the world.
-public struct Release {
-    
-    // MARK: Properties
-    
-    /// The official release date (if released) of an amiibo in Australia.
-    public let australia: Date?
-    
-    /// The official release date (if released) of an amiibo in Europe.
-    public let europe: Date?
-    
-    /// The official release date (if released) of an amiibo in Japan.
-    public let japan: Date?
-    
-    /// The official release date (if released) of an amiibo in North America.
-    public let america: Date?
-
-}
-
-// MARK: - Decodable
-
-extension Release: Decodable {
-    enum CodingKeys: String, CodingKey {
-        case australia = "au"
-        case europe = "eu"
-        case japan = "jp"
-        case america = "na"
-    }
-}

Sources/Models/Usage.swift

@@ -1,21 +0,0 @@
-/// This model struct represents how an amiibo is used with a particular game, when requested to the respective [remote API endpoint](https://www.amiiboapi.com/docs/#showUsage).
-public struct Usage {
-    
-    // MARK: Properties
-    
-    /// The explanation on how an amiibo is being used with a particular game.
-    public let explanation: String
-    
-    /// A flag that indicates whether an amiibo is only read-only or the game can also write information to the amiibo.
-    public let isWritable: Bool
-
-}
-
-// MARK: - Decodable
-
-extension Usage: Decodable {
-    enum CodingKeys: String, CodingKey {
-        case explanation = "Usage"
-        case isWritable = "write"
-    }
-}