17. Implement strStr() Theory (LeetCode #28)

Problem -
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Implement strStr() function.
Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.

Clarification:
What should we return when needle is an empty string? This is a great question to ask during an interview.
For the purpose of this problem, we will return 0 when needle is an empty string.
This is consistent to C's strstr() and Java's indexOf().
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Notes - https://github.com/team-codebug/leetc...
Code (java) - https://github.com/team-codebug/leetc...

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