how to trim " " in laravel code example

Example 1: how to trim string in laravel

{{ \Illuminate\Support\Str::limit($productVal, 20, $end='...') }}

Example 2: laravel trim string blade

#at AppServiceProvider

Blade::directive('trim', function ($string) {
            $string = urldecode($string);
            $string = trim($string);
            return "<?php echo $string; ?>";
        });

#And use on Blade template

@trim('Hello world !')