Function to print a diamond shape

[Justin Whear]

On Thu, 20 Mar 2014 14:25:02 -0700, Ali Çehreli wrote:

> This is a somewhat common little exercise: Write a function that takes
> the size of a diamond and produces a diamond of that size.
> 
> When printed, here is the output for size 11:
> 
>       *
>      ***
>     *****
>    *******
>   *********
> ***********
>   *********
>    *******
>     *****
>      ***
>       *
> 
> What interesting, boring, efficient, slow, etc. ways are there?
> 
> Ali


What's the appropriate output for an even number?