docs: private String get(ChaincodeStub stub, List<String> args) {
          if (args.size() != 1) {
              throw new RuntimeException("Incorrect arguments. Expecting a key");
          }
  
          String value = stub.getStringState(args.get(0));
          if (value == null || value.isEmpty()) {
              throw new RuntimeException("Asset not found: " + args.get(0));
          }
          return value;
      }