Recap - Remove Duplicates

Write a function remove_duplicates(numbers: Array[int]) -> Array[int] that returns a new array with every number of numbers once, in the order of its first appearance.

For example, remove_duplicates([1, 2, 2, 3, 4, 4, 5]) returns [1, 2, 3, 4, 5], and remove_duplicates([5, 4, 5, 3, 4]) returns [5, 4, 3].

Use a dictionary as a set to remember the numbers you have already seen. You only write the function: Coddy calls it with different arrays and checks what it returns.