1.Write a function that returns if a string ends in ing.

2.Write a function that removes any duplicate characters from a string.

3.Write a function that reverses the casing of each character in a string.

5.Write a function that takes in a full name formatted as Last, First and outputs the name formatted as First Last.

6.Write a function that replaces the all occurrences of a given character in a string after n occurrences with another character.

7.Write a function that returns if the \(n^{th}\) character in a given string is a given character.

8.Write a function that concatenates two strings, with the longer string first.

9.Write a function that converts a list of numbers to its phone-formatted string.

10.Write a function that adds two number strings (i.e., "one" + "three" = "four").