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Create 0071-simplify-path.kt

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	`1`	`+classSolution {`
	`2`	`+funsimplifyPath(path:String):String {`
	`3`	`+val stack=LinkedList<String>()`
	`4`	`+val invalids= hashSetOf("",".","..")`
	`5`	`+`
	`6`	`+ path.split("/").forEach{`
	`7`	`+if(it==".."&& stack.isNotEmpty()) {`
	`8`	`+ stack.removeLast()`
	`9`	`+ }elseif (it!in invalids) {`
	`10`	`+ stack.addLast(it)`
	`11`	`+ }`
	`12`	`+ }`
	`13`	`+`
	`14`	`+returnif(stack.isEmpty())"/"elseStringBuilder().apply{`
	`15`	`+while (stack.isNotEmpty()) {`
	`16`	`+this.append("/")`
	`17`	`+this.append(stack.removeFirst())`
	`18`	`+ }`
	`19`	`+ }.toString()`
	`20`	`+ }`
	`21`	`+}`

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