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// starknet3.cairo
// Joe liked Jill's work very much. He really likes how useful storage can be.
// Now they decided to write a contract to track the number of exercises they
// complete successfully. Jill says they can use the owner code and allow
// only the owner to update the contract, they agree.
// Can you help them write this contract?

// I AM NOT DONE

use starknet::ContractAddress;

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#[starknet::contract]

mod A{
use starknet::ContractAddress;
#[storage]
struct Storage{
owner: ContractAddress
}

#[constructor]

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#[contract]

mod ERC20{

    ////////////////
    // LIBRARY IMPORTS
    //////////////

    use starknet::ContractAddress;
    use zeroable::Zeroable;

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use starknet::ContractAddress;


////////////////////////
// IERC721 interface
///////////////////////
#[abi]
trait IERC721{
fn name() -> felt252;
fn symbol() -> felt252;

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#[abi]
trait IERC20 {
    #[view]
    fn get_name() -> felt252;

    #[view]
    fn get_symbol() -> felt252;

    #[view]
    fn total_supply() -> felt252;

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//@Ademola Kelvin

contract Conversions {
   function explicit256To8() public pure returns (uint8) {
       uint256 a = 2022;
       uint8 b = uint8(a);
       return b; // 230.   

   }
}

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// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.4;

contract Energy{

    //have total supply
    //transferrable
    //name
    //symbol

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// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.4;
/// ogbeni
error Unauthorized();
/// @custom:experimental This is an experimental contract.
contract VendingMachine {
    address payable owner = payable(msg.sender);

    function withdraw() public {
        if (msg.sender != owner)

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 // Collect funds in a payable `stake()` function and track individual `balances` with a mapping:
    // ( Make sure to add a `Stake(address,uint256)` event and emit)

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// SPDX-License-Identifier:MIT;
pragma solidity 0.8.0;




contract DB {
// 0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2  //1
// 0x4B20993Bc481177ec7E8f571ceCaE8A9e22C02db  //2
// 0x78731D3Ca6b7E34aC0F824c42a7cC18A495cabaB //3