Remove prefix from QR code scans

lib/screens/portfolio/coin_detail/steps_withdraw.dart/amount_address_step/amount_address_step.dart

@@ -301,7 +301,7 @@ class _AmountAddressStepState extends State<AmountAddressStep> {
         barcode = 'Error';
       });
     } else {
-      final address = result;
+      final address = removeBlockchainPrefix(result);
       final uri = Uri.tryParse(address.trim());
 
       setState(() {

lib/utils/utils.dart

@@ -865,6 +865,27 @@ Future<String> scanQr(BuildContext context) async {
   );
 }
 
+/// Removes the blockchain prefix from [address]
+/// 
+/// Returns [address] if either the prefix or address are empty.
+///
+/// Example usage:
+/// ```dart
+/// removeBlockchainPrefix(eth:0x123) == '0x123'
+/// ```
+String removeBlockchainPrefix(String address) {
+  if (address.contains(':')) {
+    final List<String> parts = address.split(':');
+    final bool hasPrefix = parts.length == 2 && parts[0].isNotEmpty;
+    final bool hasAddress = parts.length == 2 && parts[1].isNotEmpty;
+    if (hasPrefix && hasAddress) {
+      return parts[1];
+    }
+  }
+
+  return address;
+}
+
 /// Function to generate password based on some criteria
 ///
 /// Adapted from code at https://blog.albertobonacina.com/password-generator-with-dart.

test/utils/utils_test.dart

@@ -0,0 +1,36 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:komodo_dex/utils/utils.dart';
+
+void main() {
+  group('removeBlockchainPrefix', () {
+    test('removes blockchain prefix from address', () {
+      const String address = 'eth:0x1234567890abcdef';
+      final String result = removeBlockchainPrefix(address);
+      expect(result, '0x1234567890abcdef');
+    });
+
+    test('removes blackcoin prefix from address', () {
+      const String address = 'blackcoin:B8Q9aZ4Mz1ZwWYaknJdZ8t3Z6z9F3Fz1Zz';
+      final String result = removeBlockchainPrefix(address);
+      expect(result, 'B8Q9aZ4Mz1ZwWYaknJdZ8t3Z6z9F3Fz1Zz');
+    });
+
+    test('returns the same address if no prefix is present', () {
+      const String address = '0x1234567890abcdef';
+      final String result = removeBlockchainPrefix(address);
+      expect(result, '0x1234567890abcdef');
+    });
+
+    test('returns the address after the prefix', () {
+      const String address = ':0x1234567890abcdef';
+      final String result = removeBlockchainPrefix(address);
+      expect(result, ':0x1234567890abcdef');
+    });
+
+    test('returns the same address if no prefix is present', () {
+      const String address = '0x1234567890abcdef:';
+      final String result = removeBlockchainPrefix(address);
+      expect(result, '0x1234567890abcdef:');
+    });
+  });
+}