Leetocde#38||Count and Say

public class Solution {
    public String countAndSay(int n) {
        if (n < 1) {
            return null;
        }
        
        String result = "1";
        int t = n;
        
        while (t > 1) {
            char[] arr = result.toCharArray();
            StringBuilder sb = new StringBuilder();
            
            for (int i = 0; i < arr.length; i++) {
                int count = 1;
                
                while ((i + 1) < arr.length && arr[i] == arr[i + 1]) {
                    count ++;
                    i++;
                }
                
                sb.append(count);
                sb.append(arr[i]);
                
                result = sb.toString();
            }
            t--;
        }  
        
        return result;
    }
}