anchor.diff:  %%% @end
   -spec show_schedule(binary()) -> term().
   show_schedule(Task) -> 
  -    gen_server:call(?SERVER, {show, Task}).
  +    case gen_server:call(?SERVER, {show, Task}) of
  +        {_TaskName, not_found} ->
  +            not_found_task;
  +        %Task = {_TaskName, {_Schedule, _Detail}} ->
  +        {_TaskName, Bin } ->
  +            %% TODO: delete theses prints in future. This output is for debug on erlang shell.
  +            io:format("~ts", [Bin]),
  +            Bin
  +    end.
   
   %%% @doc
   %%% Shows schedules of all tasks.
  
positive.code: %%%===================================================================
  %%% Internal functions
  %%%===================================================================
  
negative.code: %% TODO: specifies the proprietary schedule time format.
  -type schedule() :: term().
  -type detail() :: binary().
  -type task() :: {task_name(), {schedule(), detail()}}.
  -type node_status() :: joined | lost | joinning | leaving.
  
  %%%===================================================================
  