Use Ocaml language to writing function called warmups.ml Write this function in a pure functional style…

Use Ocaml language to writing function called warmups.ml
Write this function in a pure functional style only: no assignment
statements, no explicit loops, and no arrays!
Here are the problem you have to solve:
Write a new factorial function using pattern matching which is
tail-recursive (i.e. it doesn’t cause the stack to grow
and there are no pending operations). You will need an internal
helper function