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

.

#include<iostream>
#include<string>
#include<vector>

using namespace std;

int lengthOfLastWord(const char *s) {
if (s==NULL)
return 0;
int laslen =0;
while (*s!='\0')
{
if (*s!=' ')
{
int curlen = 0;
while(*s!='\0'&&*s!=' ')s++,curlen++;
laslen = curlen;
}
else
s++;
}
return laslen;
}