A simple example of say hello in Solidity.

    mapping(address => string) public greetings;

greeting format stored: 0x680cde08860141f9d223ce4e620b10cd6741037e says hello to Dani!!!

Create a .env file using example.env as a template

npm install

npm run deploy

npx hardhat getGreetings --account 0x680cde08860141F9D223cE4E620B10Cd6741037E

npx hardhat sayHelloTo --someone Dani

After the deployment, you can call the sayHelloTo method, with a someone string parameter:

0x57cb13cbef735fbdd65f5f2866638c546464e45f says hello to Daniel!!!