Christmas tree

Function Kata „Christmas tree“

Write a function that „draws“ a Christmas tree with ASCII characters (ASCII art). The „picture“should be returned as a collection of strings. See the following example of a tree with height 5:

Christmastree.Draw(5)
       X
      XXX
     XXXXX
    XXXXXXX
   XXXXXXXXX
       X

Variation #1

The Christmas tree may have a star at the top:

Christmastree.DrawWithTop(5) or Christmastree.Draw(5, true)
       *
       X
      XXX
     XXXXX
    XXXXXXX
   XXXXXXXXX
       X