diff --git a/c_src/tracer/tpTracerNif.c b/c_src/tracer/tpTracerNif.c
index 6d60345..862a813 100644
--- a/c_src/tracer/tpTracerNif.c
+++ b/c_src/tracer/tpTracerNif.c
@@ -170,7 +170,6 @@ static ERL_NIF_TERM enabled_garbage_collection(ErlNifEnv *env, int argc, const E
 
 // trace(TraceTag, TracerState, Tracee, TraceTerm, Opts)
 static ERL_NIF_TERM trace(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
-    // IMY-todo 参数打印
     // enif_fprintf(stdout, "IMY************trace:");
     // for (int i = 0; i <= argc - 1; i++) {
     //     if (i != 1) {
diff --git a/src/messages/tpMsgSD.erl b/src/messages/tpMsgSD.erl
index 1a7d263..45a97bf 100644
--- a/src/messages/tpMsgSD.erl
+++ b/src/messages/tpMsgSD.erl
@@ -118,22 +118,22 @@ formatEvent({Type, From, _, {'$gen_call', {From, Ref}, Msg}, To}, State) ->
    NumCalls = get(num_calls) + 1,
    put(num_calls, NumCalls),
    put(Ref, NumCalls),
-   eFmt:formatBin(<<"    \"~w~s\" ~s \"~w~s\" [label=\"gen:call #~w ~9999P\"];~n">>, [From, label(From, State), case Type of send ->
-      "->"; _ -> "-->" end, To, label(To, State), NumCalls, Msg, 8]);
+   eFmt:formatBin(<<"    \"~w~s\" ~s \"~w~s\" [label=\"gen:call #~w ~9999P\"];~n">>, [From, label(From, State),
+      case Type of send -> "->"; _ -> "-->" end, To, label(To, State), NumCalls, Msg, 8]);
 formatEvent(Event = {Type, From, _, {Ref, Msg}, To}, State) ->
    case get(Ref) of
       undefined ->
          defFormatEvent(Event, State);
       NumCall ->
-         eFmt:formatBin(<<"    \"~w~s\" ~s \"~w~s\" [label=\"#~w ~9999P\"];~n">>, [From, label(From, State), case Type of send ->
-            "->"; _ -> "-->" end, To, label(To, State), NumCall, Msg, 8])
+         eFmt:formatBin(<<"    \"~w~s\" ~s \"~w~s\" [label=\"#~w ~9999P\"];~n">>, [From, label(From, State),
+            case Type of send -> "->"; _ -> "-->" end, To, label(To, State), NumCall, Msg, 8])
    end;
 formatEvent(Event, State) ->
    defFormatEvent(Event, State).
 
 defFormatEvent({Type, From, _, Msg, To}, State) ->
-   eFmt:formatBin(<<"    \"~w~s\" ~s \"~w~s\" [label=\"~9999P\"];~n">>, [From, label(From, State), case Type of send ->
-      "->"; _ -> "-->" end, To, label(To, State), Msg, 8]).
+   eFmt:formatBin(<<"    \"~w~s\" ~s \"~w~s\" [label=\"~9999P\"];~n">>, [From, label(From, State),
+      case Type of send -> "->"; _ -> "-->" end, To, label(To, State), Msg, 8]).
 
 label(P, #state{meta = Meta}) ->
    case maps:get(P, Meta, #{}) of