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1. [100pts] Download hw.cpp. It is supposed to work as follows.
   1. It reads in ints from the user until a negative number is entered, storing them into a linked list.
   2. It will print out the contents of the list.
   3. Enter a loop that ends on "quit" but takes a couple commands:
      • "enter 7 after 9": You should insert the number (7) after the first occurrence of their target number (9).
      • "remove 12": You should remove the number (12) from the list.
      The program should print the current list from the front to the back, right after executing a command.

   Example runs:

   $ ./hw
   71 22 84 12 95 10 8 54 -1
   71 22 84 12 95 10 8 54
   > enter 23 after 12
   71 22 84 12 23 95 10 8 54
   > remove 84
   71 22 12 23 95 10 8 54
   > enter 40 after 22
   71 22 40 12 23 95 10 8 54
   > remove 71
   22 40 12 23 95 10 8 54
   > enter 77 after 95
   22 40 12 23 95 77 10 8 54
   > quit
   

   Your Task

   • Proivde library ll so that the program works correctly.
   • Use the following Makefile.
   • Do not touch hw.cpp.

   Tips

   • Your program should end with no memory errors, when your program is run with valgrind.
   • For the "remove" command, a recursive solution will probably be easier.

   Turn in

   • Written portion: Turn in the hardcopy in class.
   • Programming portion: Submit your source code files and Makefile.

     ~/bin/submit -c=IC210 -p=hw34 Makefile *.cpp *.h