Rivr data structure

data.java

String username;
String password;
int tries = 0;
do {
  tries++;
  username = processDtmfTurn(askLogin);
  password = processDtmfTurn(askPassword);
  askLogin = incorrect;
} while (!validate(username, password) && tries < 3);
if (tries == 3) {
  processTurn(audio("goodbye", "vm-goodbye"));
  return null;
}
return new User(username, password);