homework stuff

gistfile1.java

public String checkPassword(String password){
  //... your previous logic
  for (int i = 0 ; i < password.length - 3; i++) {
    if (password.charAt(i) == password.charAt(i+1) && password.charAt(i) == password.charAt(i+2)) {
      result = "invalid";
    }
  }
  return result;
}