STEP 11: Now that we've returned the damage value, where does it go? We need to store it in a variable!

When calling a function that returns a value, we need to store it in a return variable so that we can use it outside the function. This is done by assigning a variable before a function call using an equals sign.

• Find the fireball() function and look for this function call: calculate_damage(caster,·"fireball")
• Add code to this line so that it looks like this: damage = calculate_damage(caster, "fireball")

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