If I want a copy of the string, I've got to whip out my week 1 skills of just iterating with a four loop from left to right and make copies of those characters.
我需要那个字符串的一个拷贝,我使用,第一周的技巧,从左到右做四次迭代,然后复制这4个字符。
First, I'm going to do a sanity check strlen so we've used string length, strlen, before.
首先,我先做一个检查,我们以前使用过字符串长度函数。
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