Write a program Merge that takes a delimiter string followed by an arbitrary number of file names as command-line arguments; concatenates the corresponding lines of each file, separated by the...

Write a program Merge that takes a delimiter string followed by an arbitrary number of file names as command-line arguments; concatenates the corresponding lines of each file, separated by the delimiter; and then prints the result to standard output, thus performing the opposite operation of Split (Program 3.1.9).