truncateRight$

A function that can be used in Formulas.

## Syntax and semantics

`truncateRight$` (`string$`, `maximumNewWidth`)
  remove characters from the left of `string$` until the result is at least as short as `maximumNewWidth`:

`assert truncateRight$ ("hello", 3) = "hel"
` `assert truncateRight$ ("hello", 5) = "hello"
`

No padding takes place, so the resulting string may be shorter than `maximumNewWidth`:

`assert truncateRight$ ("hello", 12) = "hello"
`

Note that `maximumNewWidth` cannot be negative:

`asserterror Can never truncate a string down to -3 characters.
` `a$ = truncateRight$ ("hello", -3)
`

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- Functions