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You are given an absolute path for a Unix-style file system, which always begins with a slash '/'. 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. 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 used to denote current or parent directories. Return the simplified canonical path.
Example 1
Input: path = /a/./b/../../c/
Output: /c
Explanation: Go into a, stay put for '.', go into b, then '..' twice goes back up through b and a to the root. Finally go into c, so the result is "/c".
Example 2
Input: path = /home/
Output: /home
Explanation: The trailing slash is dropped, leaving "/home".
Example 3
Input: path = /../
Output: /
Explanation: Going up from the root stays at the root, so the answer is "/".
Split the path on '/' and process each piece with a stack: a real name is pushed, '..' pops the last name (go up), and '.' or empty pieces are ignored. Joining the stack with slashes gives the canonical path.
Run checks all cases above. Submit evaluates all test cases.