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The PR adds instructions on steps a learner has to follow to be able to successfully call the
buyProductfunction of the marketplace contract on Remix.With IERC20Token contracts, for security purposes, an account
originalTokenOwnerhas to call on the token-contract'sapprovefunction passing in theaccountToBeApprovedandtokenAmountInDecimalsbeforeaccountToBeApprovedcan calltransferFromas it was called in thebuyProductfunction.