https://blog.csdn.net/u013165704/article/details/53758736
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memset
https://www.runoob.com/cprogramming/c-function-memset.html -
memcpy(内存拷贝)
https://blog.csdn.net/m0_65601072/article/details/125904069
偏移拷贝：https://www.codenong.com/1163624/
内存分配
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malloc
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realloc （重用扩展内存）
https://zhuanlan.zhihu.com/p/575885325
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