Write a BCPL program that reads a sequence of strings typed by the user
and creates a linked list containing them all.

An input of END will be used to mark the end of the input sequence.

Once the whole linked list has been read, print out its contents, one
string per line. It is OK if the content comes out 'backwards'.

Remember you will need to implement and use strdup()

Include a transcript showing a successful run of your program.