public function __invoke()
{
$input = file_get_contents(__DIR__ . '/../../data/day1.txt');
$elevator = new Elevator();
foreach (str_split($input) as $char) {
if ($char == '(') {
$elevator->goUp();
} elseif ($char == ')') {
$elevator->goDown();
}
}
echo 'Floor: ' . $elevator->floor();
}
