It took two years for three former school friends in Limerick to take an idea for a new clean energy drink to launch. Twenty-something-year-old co-founders Molly Ryan, Jake Ryan, and Tom Murphy are launching their new venture called YOJO Energy this week.   “The idea for YOJO came from frustration at how traditional energy drinks had excessively high sugar levels and how, after you drink them, you get a spike and then a crash,” Molly Ryan explained. “They end up making you feel worse after taking them.”  She said that other energy drinks had high levels of caffeine or used sweeteners…