With empty Makefile.am, error has disappear, but didn't build any thing. So add test-FileRandomizer.c to build,
and create src/FileRandomizer.h to avoid error on building test application
we could run cutter test/ , but to automate tests we create a script test/run-test.sh we can run to complete the build and test process
we created test program, and write code in src/FileRandomizer.c in order to solve error on test condition
we added a mocking function for fopen, in order to ensure the fopen is called...