[xubuntu] E:malformed line 52 in source list...

I've seen a couple of similar posts about this, but none of the solutions worked for me. I'm using Xubuntu 15.10, and i was trying to install Skype (I'm sorry if that was a stupid thing to do, but I'm super new to Xubuntu, and Linux in general). after going through some tutorials, with no success, i gave up. after an hour of regular computer use, I tried to start up the Software center, only to be informed that i have a malformed line 52 in the source list. i will copy and paste the sources.list file for you guys if you want to take a look at it. I'm super sorry if i made a really dumb and easily fixed mistake, but again, I've only had Linux for about a week, my apologies...