another commit

lib/widgets/thousandSeparator.dart

@@ -0,0 +1,50 @@
+// ignore_for_file: file_names
+
+import 'package:flutter/services.dart';
+
+class ThousandsSeparatorInputFormatter extends TextInputFormatter {
+  static const separator = ','; // Change this to '.' for other locales
+
+  @override
+  TextEditingValue formatEditUpdate(
+      TextEditingValue oldValue, TextEditingValue newValue) {
+    // Short-circuit if the new value is empty
+    if (newValue.text.isEmpty) {
+      return newValue.copyWith(text: '');
+    }
+
+    // Handle "deletion" of separator character
+    String oldValueText = oldValue.text.replaceAll(separator, '');
+    String newValueText = newValue.text.replaceAll(separator, '');
+
+    if (oldValue.text.endsWith(separator) &&
+        oldValue.text.length == newValue.text.length + 1) {
+      newValueText = newValueText.substring(0, newValueText.length - 1);
+    }
+
+    // Only process if the old value and new value are different
+    if (oldValueText != newValueText) {
+      int selectionIndex =
+          newValue.text.length - newValue.selection.extentOffset;
+      final chars = newValueText.split('');
+
+      String newString = '';
+      for (int i = chars.length - 1; i >= 0; i--) {
+        if ((chars.length - 1 - i) % 3 == 0 && i != chars.length - 1) {
+          newString = separator + newString;
+        }
+        newString = chars[i] + newString;
+      }
+
+      return TextEditingValue(
+        text: newString.toString(),
+        selection: TextSelection.collapsed(
+          offset: newString.length - selectionIndex,
+        ),
+      );
+    }
+
+    // If the new value and old value are the same, just return as-is
+    return newValue;
+  }
+}