how to fix URL Resolve, 301 redirects in the htaccess file

I’m a novice and I work PHP. My professor introduced a site that gives me website problems. (woorank) My site has a problem with 301 redirects. Look at the picture below.

Click to see my problem

My problem is and I want to resolve this problem in the .htaccess file. I knew the following code answered this but was wrong

// URL Resolve
if (currentUrl() == "http://example.com") {
    redirectToMainDomain();
} elseif (currentUrl() == "http://www.example.com") {
    redirectToMainDomain();
} elseif (currentUrl() == "https://example.com") {
    redirectToMainDomain();
} elseif (currentUrl() == "https://www.example.com") {
    redirectToMainDomain();
}

I wrote the above code on the first line of codes, but my problem was not resolved, I do something like this to apply in the .htaccess file.

if (currentUrl() == "https://www.example.com" or currentUrl() == "https://example.com" or currentUrl() == "http://example.com" or currentUrl() == "http://www.example.com") {
        header("Location: https://example.com");
        exit;
    }
if (currentUrl() == "https://www.example.com/blog/index.php" or currentUrl() == "https://example.com/blog/index.php" or currentUrl() == "http://example.com/blog/index.php" or currentUrl() == "http://www.example.com/blog/index.php") {
        header("Location: https://example.com/blog/index.php");
        exit;
    } 
// and other pages

Please guide

Answer

I am the author of the question. You can fix this using the following code in your .htaccess file:

RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]