# Writing a Smart Contract

// SPDX-License-Identifier: MIT

// Specifies that the source code is for a version

// of Solidity greater than 0.8.15

pragma solidity ^0.8.15;

`contract HelloWorld {`

    `// A publicly accessible function that takes a string as a parameter`

    `` // and echoes the `message` ``

    `function echo(string memory message) public pure returns (string memory) {`

        `return message;`

    `}`

`}`