Day one.

If two of my friends were not getting along and I wanted them to be friends there is many ways I could go about trying to get them together. I would start off by having one on one talks with each of my friends and discussing with them why they do not like one another. Secondly i would try and secretley arange a time and place to trick the two into meeting there so i could get them together and have a group discussion. I would not allow them to leave until they had resolved their issues and were friends. There is no reason why they couldn't get along and i would do everything in my power to try and get them to be friends.