message: abbreviate_verkey String -> &cstr
diff: @@ -177,7 +177,7 @@ impl DidCommandExecutor {
  }
  DidCommand::AbbreviateVerkey(did, verkey, cb) => {
  info!("AbbreviateVerkey command received");
  - cb(self.abbreviate_verkey(did, verkey));
  + cb(self.abbreviate_verkey(&did, verkey));
  }
  DidCommand::GetNymAck(wallet_handle, result, deferred_cmd_id) => {
  info!("GetNymAck command received");
  @@ -487,7 +487,7 @@ impl DidCommandExecutor {
  }
  fn abbreviate_verkey(&self,
  - did: String,
  + did: &str,
  verkey: String) -> Result<String, IndyError> {
  info!("abbreviate_verkey >>> did: {:?}, verkey: {:?}", did, verkey);
  