fn all_op(env: soroban_sdk::Env) -> soroban_sdk::Vec
fn store_operation(
env: soroban_sdk::Env,
x: u32,
y: u32,
result: u32,
operation_type: OperationType,
) -> u32
fn hello(
env: soroban_sdk::Env,
to: soroban_sdk::String,
) -> soroban_sdk::Vec
fn sum(env: soroban_sdk::Env, x: u32, y: u32) -> u32
fn sub(env: soroban_sdk::Env, x: u32, y: u32) -> u32
fn mul(env: soroban_sdk::Env, x: u32, y: u32) -> u32
fn div(env: soroban_sdk::Env, x: u32, y: u32) -> u32
fn last_op(env: soroban_sdk::Env) -> Option
fn get_op(env: soroban_sdk::Env, id: u32) -> Option