fn add_score(
env: soroban_sdk::Env,
player_name: soroban_sdk::String,
score: u32,
) -> soroban_sdk::String
fn get_scores(env: soroban_sdk::Env) -> soroban_sdk::Vec
fn delete_score(env: soroban_sdk::Env, id: u64) -> soroban_sdk::String