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

contract HelloWorld {
    function sayHello() public pure returns (string memory) {
        return "Hello, World!";
    }
}

Thought process: "Smart contracts are amazing! I’m practically building the future of finance!"
Senior dev: "Cool. Did you run tests? Wait, where’s your test environment setup?"

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

contract HelloWorld {
    string public greeting;

    constructor() {
        greeting = "Hello, World!";
    }

    function sayHello() public view returns (string memory) {
        return greeting;
    }

    function updateGreeting(string memory _newGreeting) public {
        greeting = _newGreeting;
    }
}

Thought process: "Look at this! Constructor, state variables, and a setter! I’m a blockchain pro now."
Code reviewer: "Why didn’t you check who can call updateGreeting? You just gave the internet access to your contract!"

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

contract HelloWorld {
    string private greeting;
    address private owner;

    modifier onlyOwner() {
        require(msg.sender == owner, "Not authorized");
        _;
    }

    constructor() {
        greeting = "Hello, World!";
        owner = msg.sender;
    }

    function sayHello() public view returns (string memory) {
        return greeting;
    }

    function updateGreeting(string memory _newGreeting) public onlyOwner {
        greeting = _newGreeting;
    }
}

Thought process: "Added owner checks and modifiers. I’m basically a Solidity ninja now."
Senior dev: "Nice. But what happens if the owner loses their private key?"

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

import "@openzeppelin/contracts/access/Ownable.sol";

contract HelloWorld is Ownable {
    string private greeting;

    constructor() {
        greeting = "Hello, World!";
    }

    function sayHello() public view returns (string memory) {
        return greeting;
    }

    function updateGreeting(string memory _newGreeting) public onlyOwner {
        greeting = _newGreeting;
    }
}

Thought process: "Reusing OpenZeppelin’s Ownable contract. Cleaner, safer, and more maintainable!"
Manager: "Great job! Now, we need a gas optimization plan and multi-sig support for the owner."

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

import "@openzeppelin/contracts/access/Ownable.sol";

contract HelloWorld is Ownable {
    string private greeting;

    event GreetingUpdated(string oldGreeting, string newGreeting);

    constructor() {
        greeting = "Hello, World!";
    }

    function sayHello() public view returns (string memory) {
        return greeting;
    }

    function updateGreeting(string memory _newGreeting) public onlyOwner {
        emit GreetingUpdated(greeting, _newGreeting);
        greeting = _newGreeting;
    }
}

Thought process: "Added events for better logging and tracking. Delegating tasks to mid-level devs is exhausting, but I’m thriving."
CTO: "Cool, but let’s prioritize audit readiness and scalability."

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

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/Pausable.sol";

contract HelloWorld is Ownable, Pausable {
    string private greeting;

    event GreetingUpdated(string oldGreeting, string newGreeting);

    constructor() {
        greeting = "Hello, World!";
    }

    function sayHello() public view whenNotPaused returns (string memory) {
        return greeting;
    }

    function updateGreeting(string memory _newGreeting) public onlyOwner {
        emit GreetingUpdated(greeting, _newGreeting);
        greeting = _newGreeting;
    }

    function pause() public onlyOwner {
        _pause();
    }

    function unpause() public onlyOwner {
        _unpause();
    }
}

Thought process: "Pause functionality, modular design, and audit-ready! Time to start pitching to investors."
CEO: "Impressive. Now, explain to me how this makes money."

"We're disrupting the greeting industry with cutting-edge blockchain technology. 
Our platform delivers unparalleled transparency, decentralization, and immutable greetings. 
Invest now, and you too can own a piece of the future. "

Thought process: "Let’s raise $10M in funding."

And that’s how "Hello, World!" becomes a multi-million-dollar startup pitch.

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

contract HelloWorld {
    function sayHello() public pure returns (string memory) {
        return "Hello, World!";
    }
}

Thought process: "Smart contracts are amazing! I’m practically building the future of finance!"
Senior dev: "Cool. Did you run tests? Wait, where’s your test environment setup?"

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

contract HelloWorld {
    string public greeting;

    constructor() {
        greeting = "Hello, World!";
    }

    function sayHello() public view returns (string memory) {
        return greeting;
    }

    function updateGreeting(string memory _newGreeting) public {
        greeting = _newGreeting;
    }
}

Thought process: "Look at this! Constructor, state variables, and a setter! I’m a blockchain pro now."
Code reviewer: "Why didn’t you check who can call updateGreeting? You just gave the internet access to your contract!"

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

contract HelloWorld {
    string private greeting;
    address private owner;

    modifier onlyOwner() {
        require(msg.sender == owner, "Not authorized");
        _;
    }

    constructor() {
        greeting = "Hello, World!";
        owner = msg.sender;
    }

    function sayHello() public view returns (string memory) {
        return greeting;
    }

    function updateGreeting(string memory _newGreeting) public onlyOwner {
        greeting = _newGreeting;
    }
}

Thought process: "Added owner checks and modifiers. I’m basically a Solidity ninja now."
Senior dev: "Nice. But what happens if the owner loses their private key?"

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

import "@openzeppelin/contracts/access/Ownable.sol";

contract HelloWorld is Ownable {
    string private greeting;

    constructor() {
        greeting = "Hello, World!";
    }

    function sayHello() public view returns (string memory) {
        return greeting;
    }

    function updateGreeting(string memory _newGreeting) public onlyOwner {
        greeting = _newGreeting;
    }
}

Thought process: "Reusing OpenZeppelin’s Ownable contract. Cleaner, safer, and more maintainable!"
Manager: "Great job! Now, we need a gas optimization plan and multi-sig support for the owner."

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

import "@openzeppelin/contracts/access/Ownable.sol";

contract HelloWorld is Ownable {
    string private greeting;

    event GreetingUpdated(string oldGreeting, string newGreeting);

    constructor() {
        greeting = "Hello, World!";
    }

    function sayHello() public view returns (string memory) {
        return greeting;
    }

    function updateGreeting(string memory _newGreeting) public onlyOwner {
        emit GreetingUpdated(greeting, _newGreeting);
        greeting = _newGreeting;
    }
}

Thought process: "Added events for better logging and tracking. Delegating tasks to mid-level devs is exhausting, but I’m thriving."
CTO: "Cool, but let’s prioritize audit readiness and scalability."

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

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/Pausable.sol";

contract HelloWorld is Ownable, Pausable {
    string private greeting;

    event GreetingUpdated(string oldGreeting, string newGreeting);

    constructor() {
        greeting = "Hello, World!";
    }

    function sayHello() public view whenNotPaused returns (string memory) {
        return greeting;
    }

    function updateGreeting(string memory _newGreeting) public onlyOwner {
        emit GreetingUpdated(greeting, _newGreeting);
        greeting = _newGreeting;
    }

    function pause() public onlyOwner {
        _pause();
    }

    function unpause() public onlyOwner {
        _unpause();
    }
}

Thought process: "Pause functionality, modular design, and audit-ready! Time to start pitching to investors."
CEO: "Impressive. Now, explain to me how this makes money."

"We're disrupting the greeting industry with cutting-edge blockchain technology. 
Our platform delivers unparalleled transparency, decentralization, and immutable greetings. 
Invest now, and you too can own a piece of the future. "

Thought process: "Let’s raise $10M in funding."

And that’s how "Hello, World!" becomes a multi-million-dollar startup pitch.