add Trie tree using c
Merge remote-tracking branch 'up/master'
添加第一章第一节“1.1：左旋转字符串”的java参考代码；
添加“1.2：字符串包含.java"参考代码；
Merge pull request #361 from carlosten1989/master

Update 2.1：寻找最小的 k 个数.cpp
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Merge pull request #346 from liuyang1/master

add Trie tree using c
Merge pull request #351 from nkcoder/master

添加1.1和1.2的java参考代码
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