package Ġcom . re vol ut an . data . repository Ċ Ċ import Ġcom . re vol ut an . data . model . Exchange Rate Entity Ċ import Ġio . reactivex . Observable Ċ Ċ interface ĠExchange Rate DataStore Ġ{ ĊĠĠĠ Ġfun Ġget Exchange Rate ( base : ĠString ): ĠObservable < Exchange Rate Entity > Ċ }