This study is being done to compare three ways to give the study drug Harvoni (a tablet that includes two drugs also called Sofosbuvir/Ledipasvir) for 12 weeks in people who are infected with both Human Immunodeficiency Virus (HIV) and Hepatitis C Virus (HCV). Subjects will receive this drug as part of the study. Subjects will be randomized into one of three treatment groups: