Given an absolute path for a file (Unix-style), simplify it.
path = "/home/", => "/home" path = "/a/./b/../../c/", => "/c" path = "/a/../../b/../c//.//", => "/c" path = "/a//b////c/d//././/..", => "/a/b/c"
In a UNIX-style file system, a period ('.') refers to the current directory, so it can be ignored in a simplified path. Additionally, a double period ("..") moves up a directory, so it cancels out whatever the last directory was. For more information, look here: https://en.wikipedia.org/wiki/Path_(computing)#Unix_style
- 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".
See the full details of the problem Simplify Path at LeetCode