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https://edonymu.com/2017/02/16/c%e6%a0%87%e5%87%86%e5%ba%93%e4%b8%ad%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2%e6%93%8d%e4%bd%9c%e5%87%bd%e6%95%b0/
C标准库中的字符串操作函数