Gas optimization team 8. With modified hardhat.config.js and GasContract.json

Gas_Team_8.sol

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.19;

contract GasContract {
    // storage slot 0x00
    mapping(address => uint256) private balances;

    // storage slot 0x01
    mapping(address => Payment[]) private payments;

    // storage slot 0x02
    mapping(address => uint256) public whitelist;

    struct Payment {
        uint256 paymentType;
        uint256 amount;
    }

    event Transfer(address indexed recipient, uint256 indexed amount);

    function administrators(uint256 i) external pure returns (address) {
        assembly {
            mstore(0x40, 0x3243Ed9fdCDE2345890DDEAf6b083CA4cF0F68f2)
            mstore(0x60, 0x2b263f55Bf2125159Ce8Ec2Bb575C649f822ab46)
            mstore(0x80, 0x0eD94Bc8435F3189966a49Ca1358a55d871FC3Bf)
            mstore(0xA0, 0xeadb3d065f8d15cc05e92594523516aD36d1c834)
            mstore(0xC0, 0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266)
            return(add(0x40, mul(0x20, i)), 0x20)
        }
    }

    function totalSupply() public pure returns (uint256) {
        return 10000;
    }

    function getTradingMode() public pure returns (bool) {
        return true;
    }

    function balanceOf(address _user) public view returns (uint256) {
        return balances[_user];
    }

    function getPayments(address _user) public view returns (Payment[] memory) {
        return payments[msg.sender];
    }

    fallback() external payable {
        address arg1;
        uint256 arg2;
        assembly {
            arg1 := calldataload(4)
            arg2 := calldataload(36)
        }

        // 0263b858  =>  addToWhitelist(address,uint8)
        if (msg.sig == 0x0263b858) {
            assembly {
                mstore(0x40, arg1)
                mstore(0x60, whitelist.slot)
                sstore(keccak256(0x40, 0x40), arg2)
            }
        }
        // 56b8c724  =>  transfer(address,uint256,string)
        else if (msg.sig == 0x56b8c724) {
            assembly {
                mstore(0x00, arg1)
                // let dstSlot := keccak256(0x00, 0x40)
                sstore(
                    keccak256(0x00, 0x40),
                    add(sload(keccak256(0x00, 0x40)), arg2)
                )
            }

            unchecked {
                // balances[arg1] += arg2;

                emit Transfer(arg1, arg2);
                payments[msg.sender].push(Payment(3, arg2));
            }
        } else if (msg.sig == 0xa4ce113d) {
            uint256 arg3;
            assembly {
                arg3 := calldataload(68)
            }
            unchecked {
                payments[arg1][0].amount = arg3;
            }
        } else {
            // whiteTransfer
            unchecked {
                balances[arg1] += (arg2 - whitelist[msg.sender]);
                balances[msg.sender] += (whitelist[msg.sender] - arg2);
            }
        }
    }
}

GasContract.json

{
  "_format": "hh-sol-artifact-1",
  "contractName": "GasContract",
  "sourceName": "contracts/Gas.sol",
  "abi": [
    {
      "inputs": [
        {
          "internalType": "address[5]",
          "name": "_admins",
          "type": "address[5]"
        },
        {
          "internalType": "uint256",
          "name": "_totalSupply",
          "type": "uint256"
        }
      ],
      "stateMutability": "nonpayable",
      "type": "constructor"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": true,
          "internalType": "address",
          "name": "recipient",
          "type": "address"
        },
        {
          "indexed": true,
          "internalType": "uint256",
          "name": "amount",
          "type": "uint256"
        }
      ],
      "name": "Transfer",
      "type": "event"
    },
    {
      "inputs": [
        {
          "internalType": "address",
          "name": "_userAddrs",
          "type": "address"
        },
        {
          "internalType": "uint8",
          "name": "_tier",
          "type": "uint8"
        }
      ],
      "name": "addToWhitelist",
      "outputs": [],
      "stateMutability": "payable",
      "type": "function"
    },
    {
      "inputs": [
        {
          "internalType": "uint256",
          "name": "",
          "type": "uint256"
        }
      ],
      "name": "administrators",
      "outputs": [
        {
          "internalType": "address",
          "name": "",
          "type": "address"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [
        {
          "internalType": "address",
          "name": "_user",
          "type": "address"
        }
      ],
      "name": "balanceOf",
      "outputs": [
        {
          "internalType": "uint256",
          "name": "",
          "type": "uint256"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [
        {
          "internalType": "address",
          "name": "_user",
          "type": "address"
        }
      ],
      "name": "getPayments",
      "outputs": [
        {
          "components": [
            {
              "internalType": "uint256",
              "name": "paymentType",
              "type": "uint256"
            },
            {
              "internalType": "uint256",
              "name": "amount",
              "type": "uint256"
            }
          ],
          "internalType": "struct GasContract.Payment[]",
          "name": "",
          "type": "tuple[]"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "getTradingMode",
      "outputs": [
        {
          "internalType": "bool",
          "name": "",
          "type": "bool"
        }
      ],
      "stateMutability": "pure",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "totalSupply",
      "outputs": [
        {
          "internalType": "uint256",
          "name": "",
          "type": "uint256"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [
        {
          "internalType": "address",
          "name": "_recipient",
          "type": "address"
        },
        {
          "internalType": "uint256",
          "name": "_amount",
          "type": "uint256"
        },
        {
          "internalType": "string",
          "name": "_name",
          "type": "string"
        }
      ],
      "name": "transfer",
      "outputs": [],
      "stateMutability": "payable",
      "type": "function"
    },
    {
      "inputs": [
        {
          "internalType": "address",
          "name": "_user",
          "type": "address"
        },
        {
          "internalType": "uint256",
          "name": "_ID",
          "type": "uint256"
        },
        {
          "internalType": "uint256",
          "name": "_amount",
          "type": "uint256"
        },
        {
          "internalType": "uint256",
          "name": "_type",
          "type": "uint256"
        }
      ],
      "name": "updatePayment",
      "outputs": [],
      "stateMutability": "payable",
      "type": "function"
    },
    {
      "inputs": [
        {
          "internalType": "address",
          "name": "_recipient",
          "type": "address"
        },
        {
          "internalType": "uint256",
          "name": "_amount",
          "type": "uint256"
        },
        {
          "internalType": "uint256[3]",
          "name": "_struct",
          "type": "uint256[3]"
        }
      ],
      "name": "whiteTransfer",
      "outputs": [],
      "stateMutability": "payable",
      "type": "function"
    },
    {
      "inputs": [
        {
          "internalType": "address",
          "name": "",
          "type": "address"
        }
      ],
      "name": "whitelist",
      "outputs": [
        {
          "internalType": "uint256",
          "name": "",
          "type": "uint256"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    }
  ],
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  "linkReferences": {},
  "deployedLinkReferences": {}
}

hardhat.config.js

require("@nomiclabs/hardhat-waffle");
require("hardhat-gas-reporter");
require("hardhat/config");
const {
  TASK_COMPILE,
} = require('hardhat/builtin-tasks/task-names');

// This is a sample Hardhat task. To learn how to create your own go to
// https://hardhat.org/guides/create-task.html
task("accounts", "Prints the list of accounts", async (taskArgs, hre) => {
  const accounts = await hre.ethers.getSigners();

  for (const account of accounts) {
    console.log(account.address);
  }
});

// You need to export an object to set up your config
// Go to https://hardhat.org/config/ to learn more

/**
 * @type import('hardhat/config').HardhatUserConfig
 */
module.exports = {
  solidity: {
    compilers: [
      {
        version: "0.8.19",
        settings: {
          optimizer: {
            enabled: true,
            runs: 1,
          },
        },
      },
    ],
  },
  gasReporter: {
    currency: "USD",
  },
};


task(TASK_COMPILE)
  .setAction(async function (args, hre, runSuper) {

    // first compile
    await runSuper();


    const fs = require('fs');
    const fileName = './artifacts/contracts/Gas.sol/GasContract.json';
    const file = require(fileName);
    const Gassolabi = require('./GasContract.json')
    
    file.abi = Gassolabi.abi;

    fs.writeFile(fileName, JSON.stringify(file, null, 2), function writeJSON(err) {
      if (err) return console.log(err);
      
      console.log('overwriting ABI in ' + fileName);
    });

  });