rewrite skiplist.c, a few bug fixes #534
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您的邮件已收到,我将尽快回复，谢谢
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原本的skiplist.c文件有几个bug，特别是random_level()函数，原本的代码实际效果是返回MAX_LEVEL的1/2左右的值。新代码已编译运行测试过。
另外扫了一下，另一个子目录里的skiplist.c也有几个bug，包括获取随机层数的函数有上述同样的问题。
另一个SkipList.cpp文件的随机函数也是同样问题。