JavaScript:实现将两个给定的字符串以(On)的时间复杂度排列在一个字符串中算法
/**
* Alternative arrange the two given strings in one string in O(n) time complexity.
* @param {String} str1 first input string
* @param {String} str2 second input string
* @returns `String` return one alternative arrange string.
*/
const AlternativeStringArrange = (str1, str2) => {