refactoring_FFT_Fi…

CMakeLists.txt
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			set (fft_engine_SRC
			fft_utils.cc
			fft_engine_base.cc
			fftw_engine.cc
			projection_base.cc
			projection_finite_strain.cc
			projection_finite_strain_fast.cc
			)

			find_package(FFTW REQUIRED)
			add_library(fft ${fft_engine_SRC})
			target_link_libraries(fft Eigen3::Eigen common ${FFTW_LIBRARIES})