input: Write a python function to create a robot and test its methods.
  assert create_robot("Robo1", ["Fast", "Intelligent"]).move() == "Robot is moving."
  assert create_robot("Robo2", ["Strong", "Durable"]).speak() == "Robot is speaking."
output: def create_robot(name, characteristics):
      class Robot:
          def __init__(self, name, characteristics):
              self.name = name
              self.characteristics = characteristics
  
          def move(self):
              return "Robot is moving."
  
          def speak(self):
              return "Robot is speaking."
  
      return Robot(name, characteristics)