Bug fix: Trim $blog_twitter for delete space on twitter profil image filename

Trim $blog_twitter
Notice fix: add check if exist $array[1]

Add checking system with isset() for $array[1].
Notice message :
Notice: Undefined offset: 1 in /var/www/dropplets/functions.php on line 334
Notice fix : Add checking of existing array

Add check of $filename[count($filename) - 2] var.
Notice message :
Notice: Undefined offset: -1 in /var/www/index.php on line 33
Warning fix : fix re-download twitter profile image when it isn't in cache folder

Add a all path of cache directory on check if twitter profile image exist.
Warning message :
Warning: file_put_contents(../cache/{twitter_name}.jpg): failed to open stream: Permission denied in /var/www/dropplets/functions.php on line 350