A USB-C cable has only two connectors - one at each end. If the cable has more than two connectors, it does not conform to USB-C specifications and should not be connected to your iPad or its Power Adapter.
Anything other than certified USB-C cables can cause serious damage to your iPad and any other connected devices. Why risk using a cable of unknown specification or origin with you expensive Apple (or other) devices when you can purchase a fully certified cable for a modest outlay.
If you wish to connect multiple USB devices to your iPad, you should use an appropriate USB-C hub. There are many third-party USB Hubs that have a USB-C connection for iPad plus a USB-C PD (Power Delivery) pass-through power connector to which you can connect your USB-C Power Adapter - along with the hub itself incorporating a combination of additional USB-C ports, USB 2.0/3.1 Type-A ports, Ethernet LAN, HDMI, VGA, SD and microSD card-readers.
Perhaps consider Kingston, Anker, Hyperdrive and Satechi - although there are many others from which to choose. A Google Search for USB-C Hubs compatible with iPad will find a number of articles and recommendations.