Simplify Path

Given an absolute path for a file (Unix-style), simplify it.

For example,
path = "/home/", => "/home"
path = "/a/./b/../../c/", => "/c"

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"


@@ -418,8 +418,62 @@
 e/foo%22%0A%0A
+/**%0A * @param %7Bstring%7D path%0A * @return %7Bstring%7D%0A */%0A%0A%0A

add params