Refactoring + Checkpoint

lib/presentation/widgets/fields/participation_fee_field.dart

@@ -0,0 +1,27 @@
+import 'package:flutter/material.dart';
+
+class ParticipationFeeField extends StatelessWidget {
+  final Function(String?) onSaved;
+
+  const ParticipationFeeField({Key? key, required this.onSaved}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return TextFormField(
+      decoration: const InputDecoration(
+        labelText: 'Frais de participation',
+        border: OutlineInputBorder(),
+        filled: true,
+        fillColor: Colors.white,
+      ),
+      keyboardType: TextInputType.number,
+      validator: (value) {
+        if (value == null || value.isEmpty) {
+          return 'Veuillez entrer les frais de participation';
+        }
+        return null;
+      },
+      onSaved: onSaved,
+    );
+  }
+}