[JAVA] 프로그래머스: 암호해독

https://school.programmers.co.kr/learn/courses/30/lessons/120892

프로그래머스

public String solution(String cipher, int code) {
        String answer = "";
        char[] arr = cipher.toCharArray();
        for(int i=0;i<arr.length;i++){
            if((i+1) % code == 0){
                answer += arr[i];
            }
        }
        return answer;
}