Challang: Mash two words together.

Question

write a code that can mash any two words together. For example to mash together the words chair and seat it would output sair and cheat.

Answer 1

Rules to do it?

Answer 2

You can do anything you want and use any language you want as long as is able to connect any two words as explained in the description. 😁

Answer 3

how the code must know if the result word is a valid or invalid word?