Leia owns a robot repair shop. Luke walks into the shop with his robot, shows it to Leia, and asks if she can fix it. Leia tells Luke that she will...

Leia owns a robot repair shop. Luke walks into the shop with his robot, shows it to Leia, and asks if she can fix it. Leia tells Luke that she will fix the robot for $150. Luke says he will think about it and leaves, taking his robot with him. The next day, Luke walks back into Leia's shop. Without saying a word, he hands the robot to Leia and leaves. Leia repairs the robot and asks Luke to pay $150, but he refuses, claiming they did not form a contract.

First, do Luke and Leia have an express contract, an implied contract, or no contract at all to repair the robot, and why? Second, if they do have a contract, is it currently executed or executory, and why? Assume that Leia has finished repairing the robot, and Luke has not paid for the repair.