build/controllers/PhpDocController.php
protected function cleanDocComment($doc)
    {
        $lines = explode("\n", $doc);
        $n = \count($lines);
        for ($i = 0; $i < $n; $i++) {
            $lines[$i] = rtrim($lines[$i]);
            if (trim($lines[$i]) == '*' && trim($lines[$i + 1]) == '*') {
                unset($lines[$i]);
            }
        }

        return implode("\n", $lines);
    }
protected function cleanDocComment($doc)
    {
        $lines = explode("\n", $doc);
        $n = \count($lines);
        for ($i = 0; $i < $n; $i++) {
            $lines[$i] = rtrim($lines[$i]);
            if (trim($lines[$i]) == '*' && trim($lines[$i + 1]) == '*') {
                unset($lines[$i]);
            }
        }

        return implode("\n", $lines);
    }
remove multi empty lines and trim trailing whitespace.

@param $doc
@return string