 to now, but let's say the data
science team decides that we need to make some changes to the way we call the
`simulated_expensive_calculation` function in the future. To simplify the
update when those changes happen, we want to refactor this code so it calls the
`simulated_expensive_calculation` function only once. We also want to cut the
place where we’re currently unnecessarily calling the function twice without
adding any other calls to that function in the process. That is, we don’t want
to call it