input: Write a function to convert the given temperature from Celsius to Fahrenheit. The function should accept a single parameter representing the temperature in Celsius and return the equivalent temperature in Fahrenheit. The conversion formula is: Fahrenheit = (Celsius * 9/5) + 32.
  
  assert celsius_to_fahrenheit(0)==32.0
  assert celsius_to_fahrenheit(100)==212.0
  assert celsius_to_fahrenheit(-40)==-40.0
  assert celsius_to_fahrenheit(25)==77.0
  assert celsius_to_fahrenheit(-273.15)==-459.67
output: def celsius_to_fahrenheit(celsius):
      return (celsius * 9/5) + 32