3 (C-String) Write a program that contains the following functions A function that takes in an array, and has the user input a string. The string should be stored as a c-string A function that takes in a c-string and converts every letter to Uppercase A function that takes in a c-string and an integer value (which represents a position on the cstring), and returns the character in that position. For example, if the integer value is 5, it will return the character in position 5 of the c-string A function that takes in a c-string and outputs the content.