implicit declaration of function ... is invalid in C99
在頭文件中 #ifndef 後邊的字串不要與別的已經定義過的重複，尤爲是在COPY的程序中，尤爲要注意#ifndef 後邊的是否與定義過的重複。否則其中一個不會被執行，致使該.c文件中的API調用的時候出現警告：implicit declaration of function ... is invalid in C99.
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