Description:
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.
Example:
Input: "Hello World" Output: 5
LeetCode 58 _ Length Of Last Word 最后一个单词的长度 (Easy)
原文：https://www.cnblogs.com/zingg7/p/10648191.html