class ReservationCode {

  constructor(name, rc) {
    this.name = name;
    this.rc = rc;
  }

  getCode() {
    if (this.rc.length % 2 === 0) {// i do not assume i check

      let result='';
      for (let i = 0; i < this.rc.length; i += 2) {
        result += this.rc[i] + this.rc[i + 1] + '-'
      }
     return result.substring(result.length-1,0);
    }
  }
}