✔ 문제

✔ 풀이

class Solution {
  public String solution(String cipher, int code) {
    String answer = "";
    String[] cArr = cipher.split("");
    
    for(int i = 0; i <= cArr.length / code; i++) {
      answer += cArr[code * i - 1];
    }
    
    return answer;
  }
}