Notifications view improvement and some cleaning

components/SinglePostComponent.js

@@ -0,0 +1,28 @@
+import React, { useState, useEffect } from 'react';
+import { ScrollView } from 'react-native';
+import API from './../API.js';
+import Post from './Post.js';
+
+let SinglePostComponent = ({ postId }) => {
+    let [post, setPost] = useState({});
+    useEffect(() => {
+        let subscribed = true;
+        let getData = async ()=>{
+            if (postId){
+                let post = await API.getPost(postId);
+                if(subscribed) setPost(post);
+            }
+        }
+        getData();
+        return () => {
+            subscribed = false;
+        }
+    }, [postId]);
+    return (post._id ? (
+        <ScrollView>
+        <Post post={post}/>
+        </ScrollView>
+    ) : null);
+};
+
+export default React.memo(SinglePostComponent);