public function create()
{
$rented = Contract::select('property_id')->get();
$renters = Renter::select('id', 'first_name', 'last_name')->get()->toArray();
$properties = Property::select('id', 'address')->whereNotIn('id', $rented)->get()->toArray();
return view('contracts.create', compact('rented', 'renters', 'properties'));
}