Write a method that returns a string made up from characters in an array of strings. Characters are selected from the array of strings such that the first character of the first string is followed by the second character of the second string, and so on such that the nth character is always taken from the nth string. As a precondition, you may assume that each string in the array will have enough characters so there will be an nth character in the nth string. For example, if the array of strings contains {"abcde","xy","123456","*$%!"} you would return "ay3!". Look at the test data for additional examples.