save before flutter upgrade

lib/functions/money_format_3_decimals.dart

@@ -0,0 +1,12 @@
+String moneyFormat3Decimals(double x) {
+  List<String> parts = x.toString().split('.');
+  RegExp re = RegExp(r'\B(?=(\d{3})+(?!\d))');
+
+  parts[0] = parts[0].replaceAll(re, ',');
+  if (parts.length == 1) {
+    parts.add('00');
+  } else {
+    parts[1] = parts[1].padRight(3, '0').substring(0, 3);
+  }
+  return parts.join('.');
+}