Speedrun Stellar

// challenges/01-nft-mint/contracts/nft_mint.rs
#![no_std]
use soroban_sdk::{contract, contractimpl, contracttype, Address, Env, Symbol, String};

#[contracttype]
#[derive(Clone)]
pub struct NFT {
    pub id: u32,
    pub owner: Address,
    pub name: String,
}

#[contract]
pub struct NFTMintContract;

#[contractimpl]
impl NFTMintContract {
    /// Mint a new NFT to `owner` with `name`. Returns the NFT id.
    pub fn mint(env: Env, owner: Address, name: String) -> u32 {
        owner.require_auth();

        let next_id: u32 = env.storage().instance()
            .get(&Symbol::new(&env, "next"))
            .unwrap_or(1);

        let nft = NFT { id: next_id, owner: owner.clone(), name };
        env.storage().persistent().set(&next_id, &nft);
        env.storage().instance().set(
            &Symbol::new(&env, "next"),
            &(next_id + 1),
        );

        env.events().publish(
            (Symbol::new(&env, "mint"), owner),
            next_id,
        );
        next_id
    }

    /// Read the NFT for a given id.
    pub fn get(env: Env, id: u32) -> Option<NFT> {
        env.storage().persistent().get(&id)
    }
}