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Merge pull request #320 from hejavac/master

Merge pull request #1 from julycoding/master
Create 3.1：二分查找实现

二分查找V0.1实现版
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Rename 左旋转字符串.erl to 1.1：左旋转字符串.erl
Create 6.4：回文判断.erl

字符串回文
Merge pull request #321 from hejavac/master

添加了二分查找和回文判断
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