refactor: Clean up ApiClient code structure and improve readability

flutter/lib/core/api/api_client.dart

@@ -1,4 +1,4 @@
-import 'dart:convert';
+import 'dart:convert';
 
 import 'package:http/http.dart' as http;
 
@@ -31,11 +31,7 @@ class ApiClient {
     return _decodeOrNull(_guardResponse(response));
   }
 
-    Future<dynamic> postJson(
+  Future<dynamic> postJson(String path, {Object? body, String? token}) async {
-        String path, {
-        Object? body,
-        String? token,
-    }) async {
     final response = await _client.post(
       Uri.parse('$baseUrl$path'),
       headers: _headers(token: token),
@@ -44,11 +40,7 @@ class ApiClient {
     return _decodeOrNull(_guardResponse(response));
   }
 
-    Future<dynamic> putJson(
+  Future<dynamic> putJson(String path, {Object? body, String? token}) async {
-        String path, {
-        Object? body,
-        String? token,
-    }) async {
     final response = await _client.put(
       Uri.parse('$baseUrl$path'),
       headers: _headers(token: token),
@@ -57,11 +49,7 @@ class ApiClient {
     return _decodeOrNull(_guardResponse(response));
   }
 
-  Future<dynamic> patchJson(
+  Future<dynamic> patchJson(String path, {Object? body, String? token}) async {
-    String path, {
-    Object? body,
-    String? token,
-  }) async {
     final response = await _client.patch(
       Uri.parse('$baseUrl$path'),
       headers: _headers(token: token),
@@ -69,6 +57,18 @@ class ApiClient {
     );
     return _decodeOrNull(_guardResponse(response));
   }
+
+  Future<dynamic> deleteJson(String path, {String? token}) async {
+    final response = await _client.delete(
+      Uri.parse('$baseUrl$path'),
+      headers: _headers(token: token),
+    );
+    return _decodeOrNull(_guardResponse(response));
+  }
+
+  http.Response _guardResponse(http.Response response) {
+    if (response.statusCode >= 200 && response.statusCode < 300) {
+      return response;
     }
 
     final parsedBody = _decodeOrNull(response);
@@ -107,10 +107,7 @@ class ApiClient {
 
   dynamic _decodeOrNull(http.Response response) {
     final body = response.body.trim();
-        if (body.isEmpty) {
+    if (body.isEmpty) return null;
-            return null;
-        }
-
     try {
       return jsonDecode(body);
     } catch (_) {
@@ -121,20 +118,14 @@ class ApiClient {
   String? _extractMessage(dynamic parsedBody) {
     if (parsedBody is Map<String, dynamic>) {
       final message = parsedBody['message'];
-            if (message is String && message.trim().isNotEmpty) {
+      if (message is String && message.trim().isNotEmpty) return message;
-                return message;
-            }
       if (message is List && message.isNotEmpty) {
         return message.first.toString();
       }
       final error = parsedBody['error'];
-            if (error is String && error.trim().isNotEmpty) {
+      if (error is String && error.trim().isNotEmpty) return error;
-                return error;
-            }
-        }
-        if (parsedBody is String && parsedBody.trim().isNotEmpty) {
-            return parsedBody;
     }
+    if (parsedBody is String && parsedBody.trim().isNotEmpty) return parsedBody;
     return null;
   }
 }