refactor: replace custom CRM with Monica fork

app/Helpers/StringHelper.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace App\Helpers;
+
+class StringHelper
+{
+    /**
+     * Test if string is null or whitespace.
+     *
+     * @param  mixed  $text
+     * @return bool
+     */
+    public static function isNullOrWhitespace($text): bool
+    {
+        return ctype_space($text) || $text === '' || is_null($text);
+    }
+}