This function takes a single number with meaningful returned values from 0 up to 15. When the input is 0-9 return the string of that number. When the input is 10 return "A", 11 is "B", 12 is "C", ... 15 is "F" Hint: To convert a number to a String, you cannot typecast! ""+5 results in "5" For all other numbers return "Err"