As a result, the 20 byte block allocated by the func function is lost and results in a memory leak.

结果，func函数所分配的20个字节的块就丢失了，并导致了内存泄漏。

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Finally, it calls the overloaded function func with char type arguments.

最后，调用使用char类型的参数的重载函数func。

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The second form leaves func as a standard Python function, but optimizes calls involving newname.

第二种形式把func作为标准的python函数，但是优化了涉及newname的调用。

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