fn deposit(env: soroban_sdk::Env, institution: soroban_sdk::Address, amount: i128)fn withdraw(env: soroban_sdk::Env, institution: soroban_sdk::Address, amount: i128)fn initialize(
env: soroban_sdk::Env,
admin: soroban_sdk::Address,
token: soroban_sdk::Address,
vc_registry: soroban_sdk::Address,
owners: soroban_sdk::Vec,
threshold: u32,
) fn whitelist_institution(
env: soroban_sdk::Env,
admin: soroban_sdk::Address,
institution: soroban_sdk::Address,
)