In Elixir, please create the following TAIL RECURSIVE functions:

Q$1$: Write a function concatStr $-$ This function accepts a list that can contain values of any type. You should return the concatenation of all the strings in the list.

For example, if the input is $[3,7,$cat$,9,$dog$,$horse$,-5,$mouse$],$ you would return $$catdoghorsemouse$$

Q$2$: Write a function filterStr $$ This function accepts a list that can contain values of any type.

Build and return a new list with all the strings removed.

For example, if the input is $[3,7,$cat$,9,$dog$,$horse$,-5,$mouse$],$ you would return $[3,7,9,-5].$