第 14 步：当巫师施放 Rock Smash 法术时， rock_smash()也需要返回damage 。
我们现在已经对其进行了设置，以便每个法术都存储计算的damage并返回它。我们在哪里调用拼写函数？那是我们需要存储返回的damage值的地方。
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