No problem.
I enter the giveaways thinking that the games people want to gift are extra copies that, maybe, come from bundles etc.
I don't want to force nobody to spend their money to buy games solely for the giveaway sake :-) .
If you want to regift the code you sent me you're ok to do it (Steam said "Product already owned" so I think it didn't register it) and I will mark the giveaway as Received.
Don't worry about sending me the Voodoo key.