adjusted functions_user.php file

Hi,

I am a newbie when talking about PHP and other related stuff such as Drupal. I already tried for several times to adjust the functions_user.php file accordingly as described in the manual but every time I fail.
This message keeps occuring: Fatal error: Cannot redeclare user_delete() (previously declared in C:\xampp\htdocs\drupal-6.0\modules\user\user.module:1569) in C:\xampp\htdocs\phpBB3\includes\functions_user.php on line 565
I will attach my current patched php-file.

Could someone help me with patching this file the right way?

Thanks in advance,

Torre