input: Write a function to create a Python class named Calculator that implements two methods to add two numbers. The first method should be named add_two_numbers and should take two parameters a and b. The second method should be named add and should take three parameters a, b, and c. Both methods should return the sum of the provided numbers.
  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
  
  calculator = Calculator()
  result = calculator.add_two_numbers(1, 2)
  assert result == 3
  result = calculator.add(1, 2, 3)
  assert result == 6
  calculator = Calculator()
  result = calculator.add_two_numbers(4, 5)
  assert result == 9
  result = calculator.add(4, 5, 6)
  assert result == 15
  calculator = Calculator()
  result = calculator.add_two_numbers(0, 0)
  assert result == 0
  result = calculator.add(0, 0, 0)
  assert result == 0
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
  