Added some notes/todos and changed usages of Tuple to using the new built in record type instead

lib/wallets/example/libepiccash.dart

@@ -1,6 +1,6 @@
 import 'package:flutter/foundation.dart';
 import 'package:flutter_libepiccash/epic_cash.dart' as lib_epiccash;
-import 'package:tuple/tuple.dart';
+import 'package:mutex/mutex.dart';
 
 ///
 /// Wrapped up calls to flutter_libepiccash.
@@ -21,35 +21,55 @@ abstract class LibEpiccash {
     }
   }
 
+  ///
+  /// Fetch the mnemonic of (some? current?) wallet
+  ///
+  // TODO: ensure the above documentation comment is correct
+  // TODO: ensure this will always return the mnemonic. If not, this function should throw an exception
+  // TODO: probably remove this as we don't use it in stack wallet. We store the mnemonic separately
   static String getMnemonic() {
     return lib_epiccash.walletMnemonic();
   }
 
+  // Private function wrapper for compute
   static Future<String> _initializeWalletWrapper(
-      Tuple4<String, String, String, String> data) async {
-    final String initWalletStr =
-    lib_epiccash.initWallet(data.item1, data.item2, data.item3, data.item4);
+    ({
+      String config,
+      String mnemonic,
+      String password,
+      String name,
+    }) data,
+  ) async {
+    final String initWalletStr = lib_epiccash.initWallet(
+      data.config,
+      data.mnemonic,
+      data.password,
+      data.name,
+    );
     return initWalletStr;
   }
 
+  ///
+  /// Create and or initialize a new epiccash wallet.
+  ///
+  // TODO: Complete/modify the documentation comment above
+  // TODO: Should return a void future. On error this function should throw and exception
   static Future<String> initializeNewWallet({
     required String config,
     required String mnemonic,
     required String password,
-    required String name}) async {
-
-    String result = await compute(
+    required String name,
+  }) async {
+    final String result = await compute(
       _initializeWalletWrapper,
-      Tuple4(
-        config,
-        mnemonic,
-        password,
-        name,
+      (
+        config: config,
+        mnemonic: mnemonic,
+        password: password,
+        name: name,
       ),
     );
 
     return result;
   }
-
-
 }