main.dart

void main() {
  
  var barcode = '0023,023,45,567';
  var arrayBarcode = barcode.split(',');
  var arrayZeroLeading = arrayBarcode.where((e) => e.startsWith('0'));
  var arrayNonZeroLeading = arrayZeroLeading.map((e) => e.replaceFirst(RegExp('^0+'),'')).toList();
  
  var arrayOutput = arrayBarcode..addAll(arrayNonZeroLeading);
  var barcodeOut = arrayOutput.toSet().join(',');
  print(barcodeOut);
}