fix warnings

lib/edit_profile_page.dart

@@ -1,17 +1,16 @@
 import "package:flutter/material.dart";
-import 'dart:async';
 import 'package:cloud_firestore/cloud_firestore.dart';
 import 'main.dart'; //for currentuser & google signin instance
 import 'models/user.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
 class EditProfilePage extends StatelessWidget {
-  TextEditingController nameController = TextEditingController();
-  TextEditingController bioController = TextEditingController();
+  final TextEditingController nameController = TextEditingController();
+  final TextEditingController bioController = TextEditingController();
 
-  changeProfilePhoto(BuildContext Context) {
+  changeProfilePhoto(BuildContext parentContext) {
     return showDialog(
-      context: Context,
+      context: parentContext,
       builder: (BuildContext context) {
         return AlertDialog(
           title: Text('Change Photo'),

lib/feed.dart

@@ -1,7 +1,6 @@
 import 'package:flutter/material.dart';
 import 'image_post.dart';
 import 'dart:async';
-import 'package:async/async.dart';
 import 'main.dart';
 import 'dart:io';
 import 'dart:convert';
@@ -90,7 +89,7 @@ class _Feed extends State<Feed> with AutomaticKeepAliveClientMixin<Feed> {
     try {
       var request = await httpClient.getUrl(Uri.parse(url));
       var response = await request.close();
-      if (response.statusCode == HttpStatus.OK) {
+      if (response.statusCode == HttpStatus.ok) {
         String json = await response.transform(utf8.decoder).join();
         prefs.setString("feed", json);
         List<Map<String, dynamic>> data =
@@ -99,7 +98,7 @@ class _Feed extends State<Feed> with AutomaticKeepAliveClientMixin<Feed> {
         result = "Success in http request for feed";
       } else {
         result =
-            'Error getting a feed: Http status ${response.statusCode} | userId ${userId}';
+            'Error getting a feed: Http status ${response.statusCode} | userId $userId';
       }
     } catch (exception) {
       result = 'Failed invoking the getFeed function. Exception: $exception';