How to Async Sign Message in Solidity - Code Snippet

// Task: Async Sign Message
// Language: Solidity

function async_sign_message() {
    // Implementation for Async Sign Message
    uint result = ...; // Initialize variable
    // TODO: Implement core logic here
    // Step 1: Prepare data
    // Step 2: Process Async Sign Message
    console.log("Done");
}