String indent(){
            int indentation = this.indentation;
            if (indentation < 0)
                return "";
            else if (indentation <= 10)
                return spaces[indentation];
            else {
                StringBuilder sb = new StringBuilder();
                while (indentation > 10) {
                    sb.append(spaces[indentation]);
                    indentation -= 10;
                }
                sb.append(spaces[indentation]);
            return sb.toString();
            }
        }