generateMnemonic function
Implementation
Future<dynamic> generateMnemonic(String walletId, int strength) async {
final oldMnemonic = await _storage.read(key: walletId);
if (oldMnemonic != null && oldMnemonic.isNotEmpty) {
return Future.error(ErrorCode.mnemonicAlreadyExists);
}
final mnemonic = bip39.generateMnemonic(strength: strength);
await _storage.write(key: walletId, value: mnemonic);
}