Implemented the AmiiboFilter filter and conformed it to the Filter protocol.

Sources/Filters/AmiiboFilter.swift

@@ -0,0 +1,113 @@
+public struct AmiiboFilter {
+    
+    // MARK: Properties
+    
+    private let id: String?
+    private let head: String?
+    private let tail: String?
+    private let name: String?
+    private let type: String?
+    private let gameSeries: String?
+    private let amiiboSeries: String?
+    private let character: String?
+    private let showGames: Bool
+    private let showUsage: Bool
+    
+    // MARK: Initialisers
+    
+    public init(
+        id: String? = nil,
+        head: String? = nil,
+        tail: String? = nil,
+        name: String? = nil,
+        type: String? = nil,
+        gameSeries: String? = nil,
+        amiiboSeries: String? = nil,
+        character: String? = nil,
+        showGames: Bool = false,
+        showUsage: Bool = false
+    ) {
+        self.id = id
+        self.head = head
+        self.tail = tail
+        self.name = name
+        self.type = type
+        self.gameSeries = gameSeries
+        self.amiiboSeries = amiiboSeries
+        self.character = character
+        self.showGames = showGames
+        self.showUsage = showUsage
+    }
+    
+}
+
+// MARK: - Filter
+
+extension AmiiboFilter: Filter {
+    
+    // MARK: Functions
+    
+    func makeParameters() -> [String : String?] {
+        var parameters: [String : String?] = [:]
+        
+        if let id {
+            parameters[.Key.id] = id
+        }
+        
+        if let head {
+            parameters[.Key.head] = head
+        }
+        
+        if let tail {
+            parameters[.Key.tail] = tail
+        }
+        
+        if let name {
+            parameters[.Key.name] = name
+        }
+        
+        if let type {
+            parameters[.Key.type] = type
+        }
+        
+        if let gameSeries {
+            parameters[.Key.gameSeries] = gameSeries
+        }
+        
+        if let amiiboSeries {
+            parameters[.Key.amiiboSeries] = amiiboSeries
+        }
+        
+        if let character {
+            parameters[.Key.character] = character
+        }
+        
+        if showGames {
+            parameters[.Key.showGames] = nil
+        }
+        
+        if showUsage {
+            parameters[.Key.showUsage] = nil
+        }
+        
+        return parameters
+    }
+    
+}
+
+// MARK: - String+Key
+
+private extension String {
+    enum Key {
+        static let id = "id"
+        static let head = "head"
+        static let tail = "tail"
+        static let name = "name"
+        static let type = "type"
+        static let gameSeries = "gameSeries"
+        static let amiiboSeries = "amiiboSeries"
+        static let character = "character"
+        static let showGames = "showgames"
+        static let showUsage = "showusage"
+    }
+}