Closing a SAFE

join system coins inside the SAFEEngine:

>>> geb.system_coin_adapter.join(our_address, Wad.from_number(40)).transact()

Pay back system coins to the SAFE and withdraw collateral:

>>> geb.safe_engine.modify_safe_collateralization(collateral_type, our_address, delta_collateral=Wad.from_number(-0.2), delta_debt=Wad.from_number(-4

exit collateral from the system:

>>> geb.collateral.adapter.exit(our_address, Wad.from_number(0.2)).transact()