code: List<String> argDecls(List<String> types, List<String> args) {
          List<String> argNames = new ArrayList<>();
          for (int i = 0 ; i < types.size() ; i++) {
              argNames.add(types.get(i) + " " + args.get(i));
          }
          return argNames;
      }
docs: Generate a formal parameter list given a list of types and names.