re factor rog

lib/features/services/checkpoint_service.dart

@@ -0,0 +1,27 @@
+import 'package:dio/dio.dart';
+import 'package:rogapp/features/data/checkpoint.dart';
+
+class ApiService {
+  final Dio _dio = Dio();
+
+  Future<FeatureCollection> fetchFeatures() async {
+    try {
+      final tmp_url =
+          "https://rogaining.sumasen.net/api/inbound?rog=True&grp=養老ロゲ&ln1=136.52675654298724&la1=35.19710769333327&ln2=136.52675654298724&la2=35.38264844179004&ln3=136.65061968584442&la3=35.38264844179004&ln4=136.65061968584442&la4=35.19710769333327";
+      final response = await _dio.get(tmp_url);
+      if (response.statusCode == 200) {
+        return FeatureCollection.fromJson(response.data);
+      } else {
+        throw Exception('Failed to load features');
+      }
+    } on DioException catch (e) {
+      // Handle Dio errors here
+      print('Dio error: $e');
+      throw Exception('Failed to load features');
+    } catch (e) {
+      // Handle any other errors
+      print('General error: $e');
+      throw Exception('Failed to load features');
+    }
+  }
+}