Given a string, you need to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order.
Example 1:
Input: "Let‘s take LeetCode contest" Output: "s‘teL ekat edoCteeL tsetnoc"
Note: In the string, each word is separated by single space and there will not be any extra space in the string.
s
[LeetCode] Reverse Words in a String III 翻转字符串中的单词之三
原文：http://www.cnblogs.com/grandyang/p/6703311.html