Lc1903.Largest-Odd-Number-in-String.java

class Solution {
    public String largestOddNumber(String num) {
        for(int i=num.length()-1;i>=0;i--){
            final int k=num.charAt(i)-'0';
            if(k%2!=0) return num.substring(0,i+1);
        }
        return "";
    }
}