cancelListing function in the MartenitsaMarketplace contractDescription: The Contest Details page https://www.codehawks.com/contests/cluseb1bf0001s4tjl2rzajup says that the MartenitsaMarketplace.sol contract should also have a cancelListing function, but it doesn't.
Impact: A user can not delist a token that they listed for sale in case they change their mind.
Recommended mitigation: Add a MartenitsaMarketplace::cancelListing function.
Tools used:* Manual review
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