Simplify Path

You are given an absolute path for a Unix-style file system, which always begins with a slash '/'. Your task is to transform this absolute path into its simplified canonical path.

The rules of a Unix-style file system are as follows:

• A single period '.' represents the current directory.

• A double period '..' represents the previous/parent directory.

• Multiple consecutive slashes such as '//' and '///' are treated as a single slash '/'.

• Any sequence of periods that does not match the rules above should be treated as a valid directory or file name. For example, '...' and '....' are valid directory or file names.

The simplified canonical path should follow these rules:

• The path must start with a single slash '/'.

• Directories within the path must be separated by exactly one slash '/'.

• The path must not end with a slash '/', unless it is the root directory.

• The path must not have any single or double periods ('.' and '..') used to denote current or parent directories.

Return the simplified canonical path.

Example 1:

Input: path = "/neetcode/practice//...///../courses"

Output: "/neetcode/practice/courses"

Example 2:

Input: path = "/..//"

Output: "/"

Example 3:

Input: path = "/..//_home/a/b/..///"

Output: "/_home/a"

Constraints:

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