Function move_energy 

pub fn move_energy(
    host: &mut dyn ServerHost,
    from: &Capability<dyn EnergyHandler>,
    to: &Capability<dyn EnergyHandler>,
    max: u32,
    tx: &Transaction,
) -> Result<u32, Overanswered>

Moves up to max energy out of from into to (NeoForge’s EnergyHandlerUtil.move), in transaction tx: how much moved. As one step of move_resources: all or nothing in a transaction of its own, a move to takes only part of tried again with that part, and a handler answering more than it was asked ending it with Overanswered.