Common Elements in Three Sorted Arrays

Given three sorted integer arrays `arr1`, `arr2`, and `arr3`, return a sorted array of all unique elements that are present in all three arrays. If there are no common elements, return an empty array. ### Constraints - `1 <= arr1.length, arr2.length, arr3.length <= 10^4` - `-10^5 <= arr1[i], arr2[i], arr3[i] <= 10^5` - Each array is sorted in non-decreasing order. ### Input Format - Line 1: Space-separated integers representing `arr1`. - Line 2: Space-separated integers representing `arr2`. - Line 3: Space-separated integers representing `arr3`. ### Output Format Print the unique common elements separated by space (or empty line if none).