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When I put this code in function.php within the wp-includes folder, the following error appears:

Fatal error: Call to undefined function add_action () in /home/edcos680/public_html/edcostafotografia.com/wp-includes/functions.php on line 5005

Hi!
I found the repeated and replaces, but it did not work the customization option.
A doubt, in which function.php you include the code. Because it has wp-includes folder and in the theme folder.

Thanks

This error:

Fatal error: Cannot redeclare fix_easing_custom_style() (previously declared in /home/edcos680/public_html/edcostafotografia.com/wp-includes/functions.php:5003) in /home/edcos680/public_html/edcostafotografia.com/wp-content/themes/tripod/functions.php on line 507

Here it did not work!

The code is resulting in error.