It's not mentioned that you MUST modify the given position array, not return a new one (which was my understanding after reading the description).

As FArekkusu stated, it's not really a new or novel idea. The description is visually nice, but to me it felt like you started working on something, and just cut it short halfway. Where's the part about navigating the area, picking up items, or looking for the best path..? What about tracking where you are on the grid, picking up items, and updating robot's stats? ( even with those it would likely be a duplicate :/ )

• There's no point in putting "GO " in front of every move-command
• The usage of unicode characters forces us to use String instead of char for no reason, although ideally items should have been an enum
• Reference solution should be private
• There should be more than 1 assertion per test
• A bunch of if's is a worthless kata idea, and it's not new either