Function prependPrompt

extensions/cli/src/util/promptProcessor.ts:41–49

(
  prepend: string | undefined,
  original: string | undefined,
)

// Merges two prompts with new lines between them, handling undefined
export function prependPrompt(
  prepend: string | undefined,
  original: string | undefined,
) {
  return (
    `${(prepend ?? "").trim()}\n\n${(original ?? "").trim()}`.trim() ||
    undefined
  );
}