WIP: Move Epiccash plugin calls to an abstract class

lib/wallets/crypto_currency/coins/epiccash.dart

@@ -32,4 +32,16 @@ class Epiccash extends Bip39Currency {
 
     return LibEpiccash.validateSendAddress(address: address);
   }
+
+  String getMnemonic() {
+    return LibEpiccash.getMnemonic();
+  }
+
+  Future<String> initializeNew(({String config, String mnemonic, String password, String name})? data) {
+    return LibEpiccash.initializeNewWallet(
+        config: data!.config,
+        mnemonic: data.mnemonic,
+        password: data.password,
+        name: data.name);
+  }
 }

lib/wallets/example/libepiccash.dart

@@ -1,4 +1,6 @@
+import 'package:flutter/foundation.dart';
 import 'package:flutter_libepiccash/epic_cash.dart' as lib_epiccash;
+import 'package:tuple/tuple.dart';
 
 ///
 /// Wrapped up calls to flutter_libepiccash.
@@ -18,4 +20,36 @@ abstract class LibEpiccash {
       return false;
     }
   }
+
+  static String getMnemonic() {
+    return lib_epiccash.walletMnemonic();
+  }
+
+  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);
+    return initWalletStr;
+  }
+
+  static Future<String> initializeNewWallet({
+    required String config,
+    required String mnemonic,
+    required String password,
+    required String name}) async {
+
+    String result = await compute(
+      _initializeWalletWrapper,
+      Tuple4(
+        config,
+        mnemonic,
+        password,
+        name,
+      ),
+    );
+
+    return result;
+  }
+
+
 }