fn init(
env: soroban_sdk::Env,
admin: soroban_sdk::Address,
xpi: soroban_sdk::Address,
xlm_sac: soroban_sdk::Address,
)
fn claim(env: soroban_sdk::Env, user: soroban_sdk::Address)
fn stake(env: soroban_sdk::Env, user: soroban_sdk::Address, amount: i128)
fn deposit(env: soroban_sdk::Env, from: soroban_sdk::Address, amount: i128)
fn withdraw(env: soroban_sdk::Env, to: soroban_sdk::Address, amount: i128)
fn get_stake(env: soroban_sdk::Env, user: soroban_sdk::Address) -> Option