public function setSymbolMame($symbolName)
    {
        if (! is_string($symbolName)) {
            throw new \InvalidArgumentException('Error: Expected string but got '.gettype($symbolName));
        }
        if (trim($symbolName) === '') {
            throw new \InvalidArgumentException('Error: Expected name but got empty string ro white space');
        }

        $this->symbolName = $symbolName;
    }