Counting the Calvin cycle

You will write small functions that give the ATP and the NADPH that the Calvin cycle spends, find how many turns a number of glucose molecules need, and check the carbon.

The idea. For each carbon dioxide fixed, the cycle spends $3$ ATP and $2$ NADPH. One glucose takes $6$ turns.

Your tasks.

1. In atp, return the ATP spent for the given number of turns.
2. In nadph, return the NADPH spent for the given number of turns.
3. In turns_for, return the turns needed to make the given number of glucose molecules.
4. Set carbon_in to the carbon atoms that enter in $6$ turns: $6$ RuBP of $5$ carbon atoms each, and $6$ carbon dioxide.