fn deposit(
env: soroban_sdk::Env,
from: soroban_sdk::Address,
token: soroban_sdk::Address,
amount: i128,
)fn flash_loan(
env: soroban_sdk::Env,
initiator: soroban_sdk::Address,
loan_receiver: soroban_sdk::Address,
asset: soroban_sdk::Address,
amount: i128,
data: soroban_sdk::Vec,
)