The following problem needs to be done in SML

All exercises should all have one-line solutions using map, foldr, or foldl. You can also use other predefined functions, of course, but do not write any additional named functions and do not use explicit recursion. . If you need helper functions, use anonymous ones. For example, if the problem says write a function add2 that takes an int list and returns the same list with 2 added to every element, your answer should be fun add2 x = map (fn a => a + 2) x;

Write a function myimplode that works just like the predefined implode. In other words, it should be a function of type char list -> string that takes a list of characters and returns the string containing those same characters in that same order.