打印一个字符串使它输出是从两边往中间汇聚

#include<stdio.h>
#include<Windows.h>
int main()
{
    char arr1[] = "abcdefghijklmnopqrstuvwxyz";
    char arr2[] = "##########################";
    int left = 0;//left从下标0开始
    int right = sizeof(arr1) / sizeof(arr1[0])-2;//这里减去2是因为字符串里面包含\0;
    while (left <= right)
    {

        arr2[left] = arr1[left];
    arr2[right] = arr1[right];
    printf("%s\n", arr2); 
     Sleep(2000); //Sleep函数是为了看输出效果为一行一行显式
        left++;
    right--;
    }
    system("pause");
    return 0;
}

输出结果如下：