예제: s return "3people unFollowed me" "3people Unfollowed Me" "for the last week" "For The Last Week" Solution #1 class Solution { public String solution(String s) { StringBuilder answer = new StringBuilder(); boolean isBlank = true; s = s.toLowerCase(); for (char c : s.toCharArray()) { if (c == ' ') { isBlank = true; answer.append(c); } else if (isBlank && (c >= 'a' && c