本文介绍如何实现strStr()函数，该函数用于查找一个字符串（needle）在另一个字符串（haystack）中首次出现的位置，并返回相应的索引。如果未找到，则返回-1。文章更新了函数签名以返回索引而非指针。
Implement strStr().
Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.
Update (2014-11-02):
The signature of the function had been updated to return the index instead of the pointer. If you still see your function signature returns a char
* or String, please click the reload button to
reset your code definition.
{优快云:CODE:633753}
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