input: Write a function that creates a Python class called Calculator with two methods to add two numbers. The first method, add_two_numbers, should take two parameters and return their sum. The second method, add, should take three parameters and return their sum. The class initialization should not require any parameters.
  
  class Calculator:
   def __init__(self):
     pass
      
   def add_two_numbers(self, a, b):
     return a + b
  
   def add(self, a, b, c):
     return a + b + c
  
  assert Calculator().add_two_numbers(1, 2) == 3
  assert Calculator().add(1, 2, 3) == 6
  assert Calculator().add_two_numbers(0, 0) == 0
  assert Calculator().add(10, 20, 30) == 60
output: class Calculator:
   def __init__(self):
     pass
      
   def add_two_numbers(self, a, b):
     return a + b
  
   def add(self, a, b, c):
     return a + b + c