first commit

lib/utils/text_field_4_space_formatter.dart

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+import 'package:flutter/services.dart';
+
+class TextField4SpaceFormatter extends TextInputFormatter {
+  @override
+  TextEditingValue formatEditUpdate(
+    TextEditingValue oldValue,
+    TextEditingValue newValue,
+  ) {
+    final text = newValue.text.replaceAll(' ', '');
+    final buffer = StringBuffer();
+    for (int i = 0; i < text.length; i++) {
+      buffer.write(text[i]);
+      if ((i + 1) % 4 == 0 && i + 1 != text.length) {
+        buffer.write(' ');
+      }
+    }
+    final formattedText = buffer.toString();
+    return newValue.copyWith(
+      text: formattedText,
+      selection: TextSelection.collapsed(offset: formattedText.length),
+    );
+  }
+}

lib/utils/text_field_date_formatter.dart

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+import 'package:flutter/services.dart';
+
+class TextFieldDateFormatter extends TextInputFormatter {
+  @override
+  TextEditingValue formatEditUpdate(
+    TextEditingValue oldValue,
+    TextEditingValue newValue,
+  ) {
+    final text = newValue.text.replaceAll('/', '');
+    final buffer = StringBuffer();
+    for (int i = 0; i < text.length; i++) {
+      buffer.write(text[i]);
+      if (i == 1 && i + 1 != text.length) {
+        buffer.write('/');
+      }
+    }
+    final formattedText = buffer.toString();
+    return newValue.copyWith(
+      text: formattedText,
+      selection: TextSelection.collapsed(offset: formattedText.length),
+    );
+  }
+}