Refactor candidate parsing logic in Google adapter, which fixes only one tool call per execution

google.go

@@ -121,19 +121,17 @@ func (g google) responseToLLMResponse(in *genai.GenerateContentResponse) (Respon
 	res := Response{}
 
 	for _, c := range in.Candidates {
+		var choice ResponseChoice
+		var set = false
 		if c.Content != nil {
 			for _, p := range c.Content.Parts {
 				switch p.(type) {
 				case genai.Text:
-					res.Choices = append(res.Choices, ResponseChoice{
-						Content: string(p.(genai.Text)),
-					})
+					choice.Content = string(p.(genai.Text))
+					set = true
 
 				case genai.FunctionCall:
 					v := p.(genai.FunctionCall)
-					choice := ResponseChoice{}
-
-					choice.Content = v.Name
 					b, e := json.Marshal(v.Args)
 
 					if e != nil {
@@ -149,14 +147,17 @@ func (g google) responseToLLMResponse(in *genai.GenerateContentResponse) (Respon
 					}
 
 					choice.Calls = append(choice.Calls, call)
-
-					res.Choices = append(res.Choices, choice)
-
+					set = true
 				default:
 					return Response{}, fmt.Errorf("unknown part type: %T", p)
 				}
 			}
 		}
+
+		if set {
+			choice.Role = RoleAssistant
+			res.Choices = append(res.Choices, choice)
+		}
 	}
 
 	return res, nil