Given an absolute path for a file (Unix-style), simplify it.
For example,path = "/home/", => "/home"path = "/a/./b/../../c/", => "/c"
click to show corner cases.
Corner Cases:
Did you consider the case where path = "/../"?
In this case, you should return "/".
Another corner case is the path might contain multiple slashes '/' together,
such as "/home//foo/".
In this case, you should ignore redundant slashes and return "/home/foo".
思路:当碰到..回到上层路径,.还是......
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