Your question is Java and API Testing Coding. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Tell me how you would approach solving these Java and backend testing tasks: summing an array, replacing values in a String, replacing and substring operations on a Character in a String, and answering REST service and database questions.