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function contract(args) {
  // THIS SAMPLE ONLY SUPPORTS THE "register" FUNCTION
  if (args && args.length === 2 && args[0] === "register") {
    // GET THE CURRENT USER'S NAME OR DEFAULT TO "unknown" IF THIS IS THE FIRST CALL
    const previous_name = process.env.DB_USER_CURRENT || "unknown";
    // GET THE TOTAL USER COUNT
    const total_user_count = parseInt(process.env.DB_TOTALUSERS || "0");
    // WRITE PREVIOUS USER NAME TO STDOUT
    process.stdout.write("OUT=prevname: " + previous_name);
    process.stdout.write("\n");
    // UPDATE CURRENT USER NAME BY WRITING IT TO DB
    process.stdout.write("DBW=USER_CURRENT=" + args[1]);
    process.stdout.write("\n");
    // STORE USER NAME UNDER A STORAGE SLOT FOR PERSISTENCE (CURRENT GETS OVERWRITTEN ON EACH CALL)
    process.stdout.write("DBW=USER_" + total_user_count + "=" + args[1]);
    process.stdout.write("\n");
    // INCREMENT THE TOTAL USER COUNT
    process.stdout.write("DBW=TOTALUSERS=" + (total_user_count + 1));
    process.stdout.write("\n");
    process.exit(0);
  }
  if (args.length >= 1) {
    process.stderr.write("Wrong CMD: " + args[0]);
    process.stderr.write("\n");
    process.exit(1);
  }
  process.stderr.write("Wrong args!");
  process.stderr.write("\n");
  process.exit(1);
}
contract(process.argv.slice(2));