Tally marks are an example of a numeral system with unary encodings. A number n is represented with n tally marks. For example, 4 is represented as the string "| | | |", where each vertical line "|" is a tally. A recursive version of this definition of this encoding is as follows: Base Case: 0 is represented with zero tally marks. Recursive Case: A positive number n is represented with (1 + the number of tally marks in the representation of n-1) tally marks. Write a recursive function to calculate the unary encoding of a non-negative integer. Name the function unary_encoding(n), where n is a non-negative integer (0, 1, 2, …) and make the output a string of "|" characters separated by blank spaces, with no whitespace on the ends.