How to Async Count Vowels in D - Code Snippet

// Task: Async Count Vowels
// Language: D

void async_count_vowels() {
    // Implementation for Async Count Vowels
    auto result = ...; // Initialize variable
    // TODO: Implement core logic here
    // Step 1: Prepare data
    // Step 2: Process Async Count Vowels
    writeln("Done");
}