Sample Solidity File

// SPDX-License-Identifier: CC0-1.0
// Sample Solidity contract — samplefiles.com (for testing tools only; never deployed)
pragma solidity ^0.8.24;

contract CustomerRegistry {
    struct Customer {
        uint256 id;
        string name;
        uint256 balanceCents;
    }

    uint256 public constant VIP_THRESHOLD_CENTS = 1_000_000;
    address public immutable owner;
    Customer[] private customers;

    event CustomerAdded(uint256 indexed id, string name, uint256 balanceCents);

    error NotOwner();

    modifier onlyOwner() {
        if (msg.sender != owner) revert NotOwner();
        _;
    }

    constructor() {