I want to use a separate dataframe to perform a mutate on test as follows:

library(tidyverse)

test <- tribble(
  ~col1, ~col2, ~col3,
  "one", "a", "b",
  "two", "b", "c",
  "three", "c", "d"
)

mutator <- tribble(
  ~mutate_from, ~mutate_to,
  "a", "X",
  "b", "X"
)

Desired output:

> test
# A tibble: 3 x 3
  col1  col2  col3 
  <chr> <chr> <chr>
1 one   a     X    
2 two   b     X    
3 three c     d   

I am stuck as to how I can implement this:

test %>% 
  mutate(col3 = map(mutator, ~.x %>% ?))

The end goal is to probably have 30 or so observations in mutator, so I am looking to functionise this somehow.