Implement a credit card masker that replaces all but the 1st and last 4 digits in the provided sequence
Should not mask input shorter than 6 characters
Should not mask non-numeric characters
Implement a function that takes number input and print it in words.
For example, 14567 should return Fourteen thousand five hundred sixty seven.
Should at least convert 7 digits.
Given a string, return the character that is mostcommonly used in the string.
--- Examples maxChar("abcccccccd") === "c" maxChar("apple 1231111") === "1"