# Christmas Tree
by Helen Yu
tags: formatting, strings

## Summary
> Write a function to create a Christmas tree based on height h.
> Examples
> tree(1) ➞ [
>   "#"
> ]
> tree(2) ➞ [
>   " # ",
>   "###"
> ]
> tree(5) ➞ [
>   "    #    ",
>   "   ###   ",
>   "  #####  ",
>   " ####### ",
>   "#########"
> ]
> tree(0) ➞ []
> Notes
> N/A

## Instructions
Write a function to create a Christmas tree based on height `h`.

### Examples
```
tree(1) ➞ [
  "#"
]

tree(2) ➞ [
  " # ",
  "###"
]

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

tree(0) ➞ []
```

### Notes
N/A