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I need a code in C language, that's a Debit/Credit card number checker. The number of each card is not a random combination of digits,

I need a code in C language, that's a Debit/Credit card number checker. The number of each card is not a random combination of digits, card number is matched to match the checksum.

The code should be as simple as possible, and please write comments to each function what they are there for.

Thank you!

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