Implement the readAndDiscardLineNumbers method that reads a file produced by the preceding problem, removes the line numbers, and returns an array list of the lines.

Your method should not throw a checked exception. If there is anything wrong with the input file (i.e., it does not exist, or the format of the content is not right), throw an IllegalArgumentException. If you are catching an IOException (which you must, or your program won't compile), set it as the cause of the exception that you do throw.