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 i;
int len = strlen(s);
bool isFound = false;
int lastPos = -1;
for (i = len - 1; i >= 0; --i)
{
if (s[i] != ' ')
{
lastPos = i;
break;
}
}
if (lastPos < 0)
{
return 0;
}
for (i = lastPos - 1; i >= 0; --i)
{
if (s[i] == ' ')
{
break;
}
}
return lastPos - i;
}
};