Convert a non-negative integer num to its English words representation. Example 1: Input: num = 123 Output: "One Hundred Twenty Three" Example 2: Input: num = 12345 Output: "Twelve Thousand Three Hundred Forty Five" Example 3: Input: num = 1234567 Output: "One Million Two Hundred Thirty Four Thousand Five Hundred Sixty Seven"

class Solution {
    public String numberToWords(int num) {
        
        String res = "";
        String[] one = {"", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine"};
        String[] ten = {"", "Ten", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"};
        String[] eleven = {"Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"};
        String[] hundred = {"Hundred"};
        String[] thousand = {"Thousand"};
        String[] million = {"Million"};
        String[] billion = {"Billion"};
        int one1 = num%10;
        int ten1 = num%100/10;
        int hun1 = num%1000/100;
        int thou1 = num%1000000/1000;
        int mil1 = num%