Trim float values for MQTT

Kuhnya/include/main.h

@@ -79,3 +79,4 @@ void onWifiDisconnect(const WiFiEventStationModeDisconnected& event);
 void onMqttConnect(bool sessionPresent);
 void onMqttDisconnect(AsyncMqttClientDisconnectReason reason);
 void onMqttMessage(char* topic, char* payload, AsyncMqttClientMessageProperties properties, size_t len, size_t index, size_t total);
+void trim(char *s);