解决Codewars网站上的Josephus Survivor问题，即Josephus_Survivor！

约瑟夫斯幸存者 在此kata中，您必须正确返回谁是“幸存者”，即： 的最后一个元素。 基本上，您必须假设将n个人围成一个圈，并按照k个元素的步骤将其消除，如下所示： josephus_survivor(7,3) => means 7 people in a circle; one every 3 is eliminated until one remains [1,2,3,4,5,6,7] - initial sequence [1,2,4,5,6,7] => 3 is counted out [1,2,4,5,7] => 6 is counted out [1,4,5,7] => 2 is counted out [1,4,5] => 7 is counted out [1,4] => 5 is counted out [4] => 1 counted out, 4 is the l