Nearly 10 years after the shooting that led to Marcel Brown’s wrongful conviction, the 28-year-old sat in a Northwestern Pritzker School of Law classroom as a free man.Surrounded by his attorneys from Northwestern’s Center on Wrongful Conviction, Brown shared what it felt like when those lawyers started working on his case in January 2014.“It was great. Somebody finally cared, and they were looking at each piece instead of just running through it like my trial lawyer did,” Brown said Tuesday.Brown …