function stutter(arr) {
    if(arr.length == 0) { return []; }
    if(arr.length == 1) {
        arr.push(arr[0]);
        return arr;
    }
    let size = arr.length;
    for(let i = 0; i < size + 2; i += 2) {
        arr.splice(i + 1, 0, arr[i]);
    }
    //If last two elements are not the same
    if(arr[arr.length - 2] != arr[arr.length - 1] && arr.length != 1) {
        arr.push(arr[arr.length - 1]);
    }
    return arr;
}