input: Write a function to convert the given temperature from Celsius to Fahrenheit. Given a temperature in Celsius, return the equivalent temperature in Fahrenheit. If the given temperature is 0°C, the function should return 32°F.
  assert celsius_to_fahrenheit(0) == 32
  assert celsius_to_fahrenheit(100) == 212
  assert celsius_to_fahrenheit(-40) == -40
  assert celsius_to_fahrenheit(25) == 77
  assert celsius_to_fahrenheit(37) == 98.6
output: def celsius_to_fahrenheit(celsius):
      return (celsius * 9/5) + 32