-`"text"`– A string expression from which the first word will be extracted.
**Description**
`FIRST` returns the first whitespace‑separated token of the provided string. If the string is empty or contains only whitespace, the result is an empty string. The keyword is useful for extracting a leading command or identifier from user input.
**Example**
```basic
SET command = FIRST user_input
TALK "You entered the command: " + command
```
If `user_input` is `"search books about Rust"`, `FIRST` returns `"search"`.
**Implementation Notes**
- The keyword splits the string on any whitespace (spaces, tabs, newlines) and returns the first element.
- It does not modify the original string.
- Case‑insensitive; the returned word preserves the original casing.
