anchor.diff:  
   %% Command: "version"
   %%
  -handle_call(_Socket, <<?VERSION, _/binary>>, #state{formatter = Formatter} = State) ->
  +handle_call(_Socket, <<?VERSION>>, #state{formatter = Formatter} = State) ->
       {ok, Version} = version(),
       Reply = Formatter:version(Version),
       {reply, Reply, State};
  
positive.code:     Reply = case leo_manager_mnesia:get_histories_all() of
                  {ok, Histories} ->
                      Formatter:histories(Histories);
                  {error, Cause} ->
                      Formatter:error(Cause)
              end,
  
negative.code: 
  %% Command: "s3-del-endpoint ${END_POINT}"
  %%
  handle_call(_Socket, <<?S3_DEL_ENDPOINT, ?SPACE, Option/binary>> = Command, #state{formatter = Formatter} = State) ->
      Reply = case s3_del_endpoint(Command, Option) of
                  ok ->
                      Formatter:ok();
  