Error in difference of squares exercise in c

Programming
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I am a beginner. Can u please help figure out what the issue is?

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You shouldn’t have a main function, the test runner already has one. You should take a look at the tests to check what functions and data structures they need from your file.

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thanks for clarification. but it didn’t work without main function also

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You should look at the tests to check what they need from you. It’s often the case that they call some function or use some data structure that your files must define.

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oh, okay okay. I just realized I was doing wrong. tysm!

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