Use this snippet as a starting point when overriding functions from the parent theme (functions.php). The snippet might look like it's missing a closing php tag but this is done so there are no extra spaces added.

functions.php

<?php

/*
Make sure that the function name matches the function name in the parent theme's functions.php file.
Also in the parent theme there must be a block e.g. !function_exists('function_name_that_you_want_to_override') 
that will tell you that it is safe to override that function.
*/
function function_name_that_you_want_to_override() {
   
}