Added profile screen with API interaction, better .env usage

lib/methods/api.dart

@@ -1,5 +1,6 @@
 import 'package:shared_preferences/shared_preferences.dart';
-import 'package:http/http.dart';
+import 'package:http/http.dart' as http;
+import 'dart:convert';
 
 Future<bool> checkToken() async
 {
@@ -9,10 +10,26 @@ Future<bool> checkToken() async
   return date.isAfter(DateTime.now());
 }
 
-// Future<Map<String, dynamic>> fetchProfileData(String login) async
-// {
-//
-// }
+Future<Map<String, dynamic>> fetchProfileData(String login) async
+{
+  final uri = Uri.https(
+    'api.intra.42.fr',
+    '/v2/users/$login',
+  );
+  final token = await getToken() ?? '';
+  final response = await http.get(
+    uri,
+    headers: {
+      'Authorization': 'Bearer $token',
+      'Accept': 'application/json',
+    },
+  );
+  if (response.statusCode == 200) {
+    return jsonDecode(response.body) as Map<String, dynamic>;
+  }
+  else { throw Exception('Failed to fetch user: ${response.statusCode}'); }
+}
+
 Future<void> saveToken(String token, String refresh, DateTime expiration) async
 {
   final prefs = await SharedPreferences.getInstance();