get_user_message: Retrieve a User Message by Index
Description
Extracts the content of a user's message from an LLMMessage object at a specific index.
Usage
get_user_message(.llm, .index = NULL)
Value
Returns the content of the user's message at the specified index. If no messages are found, returns NULL.
Arguments
- .llm
A LLMMessage object.
- .index
A positive integer indicating which user message to retrieve. Defaults to NULL, which retrieves the last message.