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

.

class Solution {
public:
int lengthOfLastWord(const char *s)
{
int count=0;
int index=strlen(s)-1;
while(index>=0 && s[index]==' ')
index--;
while(index>=0 && s[index]!=' ')
{
index--;
count++;
}

//if(index==-1) return 0;
return count;
}
};