bug fix: function call change arguments json format

Author: devinyf

example/function_call/main.go

@@ -77,7 +77,7 @@ NEXT_ROUND:
 			fnName := toolCall.Function.Name
 			if fnName == "get_current_weather" {
 				argMap := toolCall.Function.GetArguments()
-				cityName := argMap["location"]
+				cityName := argMap["properties"]["location"]
 				toolAnswer := getCurrentWeather(cityName)
 				// fmt.Println("tool answer: ", tool_answer)
 

qwen/func_call_dtypes.go

@@ -42,8 +42,8 @@ type FunctionCall struct {
 }
 
 // API 接口返回的是 string, 这里转换为 map.
-func (f FunctionCall) GetArguments() map[string]string {
-	argMap := make(map[string]string)
+func (f FunctionCall) GetArguments() map[string]map[string]string {
+	argMap := make(map[string]map[string]string)
 	err := json.Unmarshal([]byte(f.Arguments), &argMap)
 	if err != nil {
 		panic(err)