# Functions
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@前字符串长度>3 前4 中4个* 后@后面所有
@前字符串长度<=3 前@前面所有 中4个* 后@后面所有
*/.
>7 前3后4中间4个*
<=7 && >4 前2后2中间4个*
<=4 && >2 前1后1中间2个*
*/.
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倒着找，substrs 中谁先找到就返回谁的 index.
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