[Leetcode] Length of Last Word

class Solution {
public:
int lengthOfLastWord(const char *s) {
// Start typing your C/C++ solution below
// DO NOT write int main() function
int length = strlen(s);
if (length == 0)
return 0;

int i = length - 1;

while (s[i] == ' ')
--i;

if (i < 0)
return 0;

int count = 0;
while (s[i] != ' ' && i >= 0)
{
++count;
--i;
}

return count;
}
};