How to Async Get File Extension in Apex - Code Snippet

// Task: Async Get File Extension
// Language: Apex

public void async_get_file_extension() {
    // Implementation for Async Get File Extension
    Object result = ...; // Initialize variable
    // TODO: Implement core logic here
    // Step 1: Prepare data
    // Step 2: Process Async Get File Extension
    System.debug("Done");
}