test.cs

// split a text into chunks
  private static List<string> CreateChunks(string text, int chunkSize, int overlap)
  {
    List<string> chunks = new List<string>();
  
    // split the text into chunks
    while (text.Length > chunkSize)
    {
      chunks.Add(text.Substring(0, chunkSize));
      text = text.Substring(chunkSize - overlap);
    }
  
    // add the last chunk
    chunks.Add(text);
  
    return chunks;
  }