strstr is a standard function that searches for occurrances of one string inside another.
This is exactly what grep does at its most basic.
It can indeed not search case insensitive but with a little thinking you will be able to figure out how to use it anyway.
Hint: how do you turn "Hello" into "HELLO"?
Your professor seems like a wise man making that statement. He tells you to first think about how you'd solve the problem rather than sit down and start coding like a maniac.
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duckman
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