isPassengerBag method
format: "0/0", "1/12"
contains "/", and two numbers two side of it
Implementation
isPassengerBag(String s) {
s = s.replaceAll('o', '0');
if (s.contains('/') &&
isNumeric(s.split('/')[0]) &&
isNumeric(s.split('/')[0])) return true;
return false;
}