Convert temperatures (C, F, K)

def celcius_to_kelvin(C):
    return C + 273.15

def fahrenheit_to_kelvin(F):
    return F - 32 / 1.8 + 273.15

def kelvin_to_fahrenheit(K):
    return 1.8 * (K - 273.15) + 32

def kelvin_to_celcius(K):
    return K - 273.15

def celcius_to_fahrenheit(C):
    return kelvin_to_fahrenheit(celcius_to_kelvin(C))

def fahrenheit_to_celcius(F):
    return kelvin_to_celcius(fahrenheit_to_kelvin(F))