The base case is whenever S1 or S2 is a zero-length string.
（基线条件（basecase）是S1或S2为长度为零的字符串的情形。
Sorting strings where some items are present but have zero length and some are absent
排序字符串，一些项存在但长度为零，一些不见了
In this case, both the length and index values are zero, so they match.
在本例中，长度和索引值都为0，所以它们是匹配的。
The string can be zero in length.
该字符串的长度可以是零。
The string can be zero in length.
该字符串的长度可以是零。
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