fn init(env: soroban_sdk::Env)fn exec_op(
env: soroban_sdk::Env,
caller: soroban_sdk::Address,
token: soroban_sdk::Address,
amount: i128,
fee: i128,
)fn upgrade(env: soroban_sdk::Env, new_wasm_hash: soroban_sdk::BytesN<32>)fn set_plan(
env: soroban_sdk::Env,
initiator: soroban_sdk::Address,
router: soroban_sdk::Address,
path: soroban_sdk::Vec,
min_profit: i128,
pool: soroban_sdk::Address,
)