How to remove folder names from URL

Question

I am making a page for training. This page has a blog with blogposts. I made a separate folder for my blog posts, but now I have a problem with this: https://www.piximum.co/blogposts/blog1/Website-in-the-age-of-social-networks I want to remove folder names (blogposts/blog1) from URL, but I couldn't find any working .htaccess code to do that. Can someone provide me some working .htaccess code for solving this problem?

Here is what I have tried:

Options +FollowSymLinks -MultiViews 
# Turn mod_rewrite on 
RewriteEngine On 
RewriteBase / 
RewriteRule ^blogposts/blog1/(.*)$ /$1 [L,NC,R]

This removes the folder names from link, but link is not going to my post.

Answer 1

I'm using an index file that handles all requests and prevent direct access to php files something like that:

<?php
session_start();
include_once 'includes/autoloader.inc.php';

define('NotDirectAccess',True);
if (isset($_SESSION['mydata'])){
      if(isset($_GET['questions'])) {
        require_once 'View/questions.php';
      }else if(isset($_GET['tests'])) {
        require_once 'View/tests.php';
      }else if(isset($_GET['groups'])) {
        require_once 'View/groups.php';
      }else if(isset($_GET['courses'])) {
        require_once 'View/courses.php';
      }else if(isset($_GET['users'])) {
        require_once 'View/users.php';
      }else if(isset($_GET['results'])) {
        require_once 'View/results.php';
      }else if(isset($_GET['profile'])) {
        require_once 'View/profile.php';
      }else{
        require_once 'View/home.php';
      }
}else{
    if(isset($_GET['register'])) {
        require_once 'View/register.php';
    }else if(isset($_GET['reset'])) {
      require_once 'View/reset.php';
    }else{
        require_once 'View/login.php';
}}

and i added this at the beginning of each php file to prevent direct access to php files

if (!defined('NotDirectAccess')){
    die('Direct Access is not allowed to this page');
}