Given a string path, which is an absolute path (starting with a slash '/') to a file or directory in a Unix-style file system, convert it to the simplified canonical path.

In a Unix-style file system, a period '.' refers to the current directory, a double period '..' refers to the directory up a level, and any multiple consecutive slashes (i.e. '//') are treated as a single slash ‘/’. For this problem, any other format of periods such as '...' are treated as file/directory names.

The canonical path should have the following format:

• The path starts with a single slash '/'.
• Any two directories are separated by a single slash '/'.
• The path does not end with a trailing '/'.
• The path only contains the directories on the path from the root directory to the target file or directory (i.e., no period '.' or double period '..')

Return the simplified canonical path.

Example

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

Solution

/**
 * @param {string} path
 * @return {string}
 */
var simplifyPath = function (path) {
  // Declare a stack to hold the path
  let stack = [];
  // Split the path into an array
  let pathArr = path.split("/");
  for (let i = 0; i < pathArr.length; i++) {
    // If the path is a double period, pop the stack
    if (pathArr[i] === "..") {
      // If the stack is empty, do nothing
      stack.pop();
      // If the path is a single period or empty, do nothing
    } else if (pathArr[i] !== "." && pathArr[i] !== "") {
      // Otherwise push the path to the stack
      stack.push(pathArr[i]);
    }
  }
  // Return the stack joined with a slash
  return "/" + stack.join("/");
};