1
var simplifyPath = function (path) {
2
  let stack = [];
3
  path = path.split("/");
4
  for (let i = 0; i < path.length; i++) {
5
    if (path[i] === "" || path[i] === ".") continue;
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    if (path[i] === "..") {
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      stack.pop();
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    } else {
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      stack.push(path[i]);
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    }
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  }
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  //edge case
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  if (stack.length === 0) return "/";
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  //edge case
15

16
  let string = "";
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  for (let j = 0; j < stack.length; j++) {
18
    string += "/" + stack[j];
19
  }
20
  return string;
21
};