Swift ) Stack 구현해보기

	import UIKit
	import Swift
	public struct Stack<T>{
	fileprivate var array=[T]()
	public var count:Int{
	return array.count
	}
	public var isEmpty:Bool{
	return array.isEmpty
	}
	public mutating func push(_ element: T){
	array.append(element)
	}
	public mutating func pop() ->T?{
	return array.popLast();
	}
	public var top: T?{
	return array.last
	}
	}
	var stackOfNames=Stack(array: ["Carl","Lisa","Stephanie","Jeff","Wade"])
	stackOfNames.push("push_Mike!")
	print(stackOfNames.array) //"Carl", "Lisa", "Stephanie", "Jeff", "Wade", "push_Mike!"]
	stackOfNames.pop()
	print(stackOfNames.array) //["Carl", "Lisa", "Stephanie", "Jeff", "Wade"]
	print(stackOfNames.top) //Optional("Wade")
	print(stackOfNames.isEmpty) //false

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