refactor: remove helper, add functions

Author: adhocore

src/Helper.php

@@ -0,0 +1,10 @@
+<?php
+
+\class_alias('Ahc\Underscore\Underscore', 'Ahc\Underscore');
+
+if (!\function_exists('underscore')) {
+    function underscore($data)
+    {
+        return new Ahc\Underscore\Underscore($data);
+    }
+}