Changing Username to Lowercase & No Spaces

I don’t know if this is best practices but it worked for me and I’m trying it out. I saw that the usernames created in the WP Users were the full name with capitalization and spaces so I changed it to lowercase and no spaces by changing a line of code in:

wp-content\plugins\sliced-invoices-contact-form-7\sliced-invoices-contact-form-7.php

from

// create the user
 $userdata = array(
     'user_login'  =>  $name,

to

// create the user
 $userdata = array(
    'user_login'  =>  strtolower(preg_replace( '/\s+/', '', $name )), // was: $name,