Cant get blog name with get_option

You need access to the property of $username to get the name

$user = wp_get_current_user();
$username= $user->display_name; 

Get option method will return the name of the site you have set in setting -> general options

$url = get_option( 'blogname');     

If you need home URL then

$url = get_option( 'home' );

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)