Hints

1. Print a badge for an employee

String interpolation can be used to create description strings.
There is a built-in method to convert a string to uppercase.

2. Print a badge for a new employee

You should check if the ID is null before using it.
You can use the equality operators to compare the value to null

3. Print a badge for the owner

You should check if the department is null before using it.
You can use the equality operators to compare the value to null