input: Write a python function to convert temperatures from Celsius to Fahrenheit using a class.
  assert Celsius_to_Fahrenheit(0).to_fahrenheit() == 32
  assert Celsius_to_Fahrenheit(100).to_fahrenheit() == 212
  assert Celsius_to_Fahrenheit(-40).to_fahrenheit() == -40
output: class Celsius_to_Fahrenheit:
      def __init__(self, celsius):
          self.celsius = celsius
      
      def to_fahrenheit(self):
          return (self.celsius * 9/5) + 32