This function removes random walk terms
denoted using `rw()`

from a formula so that they can be
processed on their own.

## Reference

This function was adapted from code written
by J Scott (under an MIT license) as part of
the `epidemia`

package (https://github.com/ImperialCollegeLondon/epidemia/).

## See also

Functions used to help convert formulas into model designs
`as_string_formula()`

,
`construct_re()`

,
`construct_rw()`

,
`enw_formula()`

,
`enw_manual_formula()`

,
`parse_formula()`

,
`re()`

,
`rw()`

,
`rw_terms()`

,
`split_formula_to_terms()`

## Examples

```
epinowcast:::remove_rw_terms(~ 1 + age_group + location)
#> ~1 + age_group + location
#> <environment: 0x55e8b65c0eb8>
epinowcast:::remove_rw_terms(~ 1 + age_group + location + rw(week, location))
#> ~1 + age_group + location
#> <environment: 0x55e8b5e90d98>
```