Arranged the folder structure of the library and test targets in the Package.

Sources/AmiiboService/Internal/Extensions/DateFormatter+Properties.swift

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+//===----------------------------------------------------------------------===
+//
+// This source file is part of the AmiiboService open source project
+//
+// Copyright (c) 2024-2025 Röck+Cöde VoF. and the AmiiboAPI project authors
+// Licensed under the EUPL 1.2 or later.
+//
+// See LICENSE for license information
+// See CONTRIBUTORS for the list of AmiiboAPI project authors
+//
+//===----------------------------------------------------------------------===
+
+import Foundation
+
+extension DateFormatter {
+    
+    // MARK: Properties
+    
+    /// An ISO timestamp formatter.
+    ///
+    /// This formatter implements the `yyyy-MM-dd'T'HH:mm:ss.SSSSSS` custom date format.
+    /// Within the context of this library, this formatter is solely used to decode a date formatted as a timestamp that is returned by the ``AmiiboService/getLastUpdated()`` function.
+    static var isoTimestamp: DateFormatter {
+        let formatter = DateFormatter()
+        
+        formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSSSS"
+        formatter.timeZone = .init(secondsFromGMT: 0)
+        
+        return formatter
+    }
+    
+}