My "guess" is that you've not completly negated but you've certainly dimished/slowed the cleansing effects. Just on the fact alone of reactivating your digestive system you've used up energy that would go towards detoxing and cleansing for digestion and dealing with all the chemical crap in Coke. Some claim that ingesting foods during a fast is like a do over and staring from scratch but I think that that is a little too broad a statement and it really depends on what/how much and each persons metabolisms and particular body types. In the Master-Cleanse Mr.B says that mint tea is Ok on the fast. No that is a warmer having some cool mint tea would be a nice refreshing brake from the lemonade.
The sugars in Coke and the sugars in maple syrup are 2 totally different things. You should do some research on refined sugar. I'm sure if you do a search on this site that you will find some info. Read the Master-Cleanse book and there Mr. B explains about the maple syrup.