input: Write a Python function to create an instance of the RaceCar class and return its string representation.
  assert str(create_racecar_instance('V8', 'manual', 'red')) == "Race car with V8 engine and manual transmission; color is red"
  assert str(create_racecar_instance('electric', 'automatic', 'blue')) == "Race car with electric engine and automatic transmission; color is blue"
  assert str(create_racecar_instance('V12', 'semi-automatic', 'green')) == "Race car with V12 engine and semi-automatic transmission; color is green"
output: class RaceCar:
      def __init__(self, engine, transmission, color):
          self.engine = engine
          self.transmission = transmission
          self.color = color
  
      def __str__(self):
          return f"Race car with {self.engine} engine and {self.transmission} transmission; color is {self.color}"
  
  def create_racecar_instance(engine, transmission, color):
      racecar = RaceCar(engine, transmission, color)
      return racecar