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Nice of you to leave something to the OP. :)

Adding one more thing in the same vein as anduril's critique, you shouldn't type actual tabs into strings (which I assume you did in the strtok format strings). Use \t instead.

Please post code that actually compiles.
Remember to use a high warning level. For gcc:
gcc -W -Wall yourprog.c


I wouldn't be so sure! :)

Run it in a debugger:
gcc -g -W -Wall yourprog.c...