✔ 문제

✔ 풀이

class Solution {
  public String solution(String my_string) {
    String answer = "";
    
    for(int i = 0; i < my_string.length(); i++) {
      if(Character.isUpperCase(my_string.charAt(i))) {
        answer += Character.isLowerCase(my_string.charAt(i));
      }else {
        answer += Character.isUpperCase(my_string.charAt(i));
      }
    }
    
    return answer;
  }
}