Delete Characters to Make Fancy String

删除一个字符串里所有三连相同的字符.

class Solution {
    public String makeFancyString(String s) {
        StringBuilder sb = new StringBuilder(s);
        for(int i = 1; i < sb.length() - 1;)
        { 
            if(sb.charAt(i - 1) == sb.charAt(i) && sb.charAt(i) == sb.charAt(i + 1))
                sb.deleteCharAt(i);
            else
                i++;
        }
        return sb.toString();
        
    }
}