input: Write a python function to create an instance of SomeClass and return its fields as a tuple.
  assert create_instance(10, 20) == (10, 20)
  assert create_instance('hello', 'world') == ('hello', 'world')
  assert create_instance(None, 3.14) == (None, 3.14)
output: def create_instance(field1, field2):
      class SomeClass:
          def __init__(self, field1, field2):
              self.field1 = field1
              self.field2 = field2
      
      instance = SomeClass(field1, field2)
      return (instance.field1, instance.field2)