input: Write a python function to create an instance of MyClass and call the do_something method.
  assert create_and_do_something('value1', 'value2') == "Doing something!"
  assert create_and_do_something(10, 20) == "Doing something!"
  assert create_and_do_something(True, False) == "Doing something!"
output: class MyClass:
      def __init__(self, arg1, arg2):
          self.arg1 = arg1
          self.arg2 = arg2
  
      def do_something(self):
          return "Doing something!"
  
  def create_and_do_something(arg1, arg2):
      instance = MyClass(arg1, arg2)
      return instance.do_something()