Rentedforloops, SIZE, and Methods

I would like to create a program using methods, rentedforloops, and SIZE. I figured out how to make a code for the line but I am completely stuck on what to do for the Top and for the Bottom. This is what I have to print out:

+---------+
|    *    |
|   /*   |
|  //*\  |
| ///*\ |
| \*/// |
|  \*//  |
|   */   |
|    *    |
+---------+
| \*/// |
|  \*//  |
|   */   |
|    *    |
|    *    |
|   /*   |
|  //*\  |
| ///*\ |
+---------+