【LeetCode】Length of Last Word

Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string.

If the last word does not exist, return 0.

Note: A word is defined as a character sequence consists of non-space characters only.

For example, 
Given s = "Hello World",
return 5.

public class Solution {
    public int lengthOfLastWord(String s) {
        int count = 0;
        if(s.length()==0)
            return 0;
        
        while(s.endsWith(" ")){
            s=s.substring(0, s.length()-1);
        }
        if(s.length()==0)
            return 0;
        int length=s.length()-1;
        while(s.charAt(length)!=' '){
            count++;
            length--;
            if(length<0)
                break;
        }
        return count;
        
    }
}