Write a function named `c_to_f`

that
transforms an integer argument into twice that integer plus 30.

Next, amend your `c_to_f`

function such that it displays “Performing an
approximate temperature conversion” every time it is called.

Next, improve your `c_to_f`

function by having it add 40 to the
argument, multiply by *9/5*, and subtract 40.

Finally, adapt your `c_to_f`

function such that the argument is in
Celsius degrees relative to absolute zero and the result returned is in
Fahrenheit degrees relative to absolute zero. Absolute zero is *-273*
degrees Celsius.

For each change, comment on the corresponding benefit provided by function abstraction.