0068. Text Justification

class Solution {
    public String buildString(ArrayList<String> arr, int width, int occu, boolean last) {
        StringBuilder sb = new StringBuilder();
        sb.append("");
        if(!last) {
            //intervals num
            int num = arr.size() - 1;
            int base = (width - occu)
        }
        else {
            for(String s: arr) {
                sb.append(s);
                sb.append(s);
            }
            sb.deleteCharAt(sb.length() - 1)
        }
    }

    public List<String> fullJustify(String[] words, int maxWidth) {
        List<String> res = new ArrayList<>();
        int n = words.length;
        int oneWordLen;
        int empt = maxWidth;
        ArrayList<String> currArr = new ArrayList<>();
        for(int i = 0; i < n; i++) {
            oneWordLen = words[i].length();
            if(empt > oneWordLen) {
                empt -= oneWordLen;
                currArr.add(words[i]);
            }
            // wrap
            else {
                boolean last = i == n - 1;
                String bu = buildString(currArr, maxWidth, maxWidth - empt, last);
                res.add(bu);
                currArr = new ArrayList<>();
                empt = maxWidth;
            }
        }
        return res;
    }
}