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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.




int lengthOfLastWord(const char *s)
	if (!s || !*s) return 0;
	int len = strlen(s);
	int sum = 0;
	int i = len - 1;
	while (i >= 0 && !isalpha(s[i])) i--;
	while (isalpha(s[i])) {
	return sum;
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