修改了sds.c和sds.h，降低了sdstrim的时间复杂度 #5
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黄大神，我发现sdstrim的查找操作（strchr）可以用字符哈希的思想重写，将查找复杂度降为O（1），从而使整个trim的时间复杂度降为O（M+N），M为c字符串长度，N为SDS的buf长度，你看看对不对？