package Ġcom . core . domain . repository Ċ Ċ import Ġcom . core . domain . User Ċ import Ġio . reactivex . Comp letable Ċ import Ġio . reactivex . Maybe Ċ import Ġio . reactivex . Single Ċ Ċ interface ĠUser Repository Ġ: ĠRepository Ġ{ ĊĊĠĠĠ Ġfun Ġretrieve ( username : ĠString ): ĠSingle < User > Ċ }