$(15$ points$)$ Remove Duplicates

a$.$ Write a method named withoutDuplicates that takes an array of

integers and returns a copy of the array without any duplicate elements.

The order of elements in the original array should be preserved in the

resulting array.

Examples:

withoutDuplicates$($new int$[]\{1,2,3\})$ returns $\{1,2,3\}$

withoutDuplicates$($new int$[]\{1,2,1,1,3,2,3\})$ returns $\{1,2,3\}$