Paste the following code into WChainToken.sol: 

// SPDX-License-Identifier: MIT 
pragma solidity ^0.8.19; 
 
import {ERC20} from “@openzeppelin/contracts/token/ERC20/ERC20.sol”; 
 
contract WChainToken is ERC20 { 
    constructor() ERC20(“W Chain Token”, “WCT”) { 
        _mint(msg.sender, 1000000 * (10 ** uint256(decimals()))); 
    } 
} 

Understanding the Code: 

• Line 1: The SPDX license identifier specifies the license for the code. 

• Line 2: Specifies the Solidity compiler version (^0.8.19 means 0.8.19 or higher). 

• Line 4: Imports OpenZeppelin’s ERC20 implementation—this gives us all 6 mandatory ERC20 functions automatically! 

• Line 6: Our contract WChainToken inherits from ERC20, meaning it gets all ERC20 functionality. 

• Line 7: The constructor runs once when the contract is deployed. It sets the token name (“W Chain Token”) and symbol (“WCT”). 

• Line 8: The _mint function creates the initial token supply (1,000,000 tokens) and assigns them to the deployer’s address. The amount is automatically adjusted for 18 decimals. 

How Does This Work? 

By inheriting from OpenZeppelin’s ERC20 contract, our WChainToken automatically includes: 

• All 6 mandatory ERC20 functions (totalSupply, balanceOf, transfer, transferFrom, approve, allowance) 

• The 3 optional functions (name, symbol, decimals) 

• Both required events (Transfer, Approval) 

• Security features and gas optimizations 

You don’t need to write any of these functions yourself. OpenZeppelin has already implemented them following industry best practices! 

Customizing Your Token: 

You can easily customize your token by changing the values in the constructor: 

• Token name: Change “W Chain Token” to your desired name 

• Token symbol: Change “WCT” to your desired symbol (typically 3-4 characters) 

• Initial supply: Change 1000000 to your desired supply 

For example: 

constructor() ERC20(“My Awesome Token”, “MAT”) { 
    _mint(msg.sender, 5000000 * (10 ** uint256(decimals()))); 
}