# Given an absolute path for a file (Unix-style), simplify it. Or in other words, convert it to the canonical path.

# In a UNIX-style file system, a period '.' refers to the current directory. Furthermore, a double period '..' moves the directory up a level.

# Note that the returned canonical path must always begin with a slash '/', and there must be only a single slash '/' between two directory names. The last directory name (if it exists) must not end with a trailing '/'. Also, the canonical path must be the shortest string representing the absolute path.


# Example 1:

# Input: path = "/home/"
# Output: "/home"
# Explanation: Note that there is no trailing slash after the last directory name.
# Example 2:

# Input: path = "/../"
# Output: "/"
# Explanation: Going one level up from the root directory is a no-op, as the root level is the highest level you can go.
# Example 3:

# Input: path = "/home//foo/"
# Output: "/home/foo"
# Explanation: In the canonical path, multiple consecutive slashes are replaced by a single one.
# Example 4:

# Input: path = "/a/./b/../../c/"
# Output: "/c"


# Constraints:

# 1 <= path.length <= 3000
# path consists of English letters, digits, period '.', slash '/' or '_'.
# path is a valid Unix path.
