# Christmas Tree

Write a function to create a Christmas tree based on height **h**.

## Examples
```text
tree(1) ➞ [
  "#"
]

tree(2) ➞ [
  " # ",
  "###"
]

tree(5) ➞ [
  "    #    ",
  "   ###   ",
  "  #####  ",
  " ####### ",
  "#########"
]

tree(0) ➞ []
```