Intuit interview questions

After I finished their online challenge, I was invited to have a phone interview with Karat (Yep Intuit outsources the first technical interview session to Karat, not sure about the following ones.) The guy who interviewed me was quite friendly. He first asked me to introduce my technical stacks. Then I was asked to explain how I solved the online coding challenge. I went through my code. And then he asked me whether there is a way to optimize it. Finally, I was asked to solve a String conversion question, which is actually simple but I messed up. Just got rejected from Intuit.