refactoring

Makefile
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			#
			# @file Makefile
			#
			# @brief Makefile for the fft library
			#
			# @copyright
			# Copyright (©) 2021 EPFL (Ecole Polytechnique Fédérale de Lausanne)
			# SPC (Swiss Plasma Center)
			#
			# SPClibs is free software: you can redistribute it and/or modify it under
			# the terms of the GNU Lesser General Public License as published by the Free
			# Software Foundation, either version 3 of the License, or (at your option)
			# any later version.
			#
			# SPClibs is distributed in the hope that it will be useful, but WITHOUT ANY
			# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
			# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
			#
			# You should have received a copy of the GNU Lesser General Public License
			# along with this program. If not, see <https://www.gnu.org/licenses/>.
			#
			# @author
			# (in alphabetical order)
			# @author Trach-Minh Tran <trach-minh.tran@epfl.ch>
			#
			FFTW=$(FFTW_HOME)
			F90 = ifort
			LD = ifort

			debug = -g -traceback -CB
			optim = -O3

			OPT=$(debug)
			#OPT=$(optim)

			F90FLAGS = $(OPT) -Dfft_w3 -I$(FFTW)/include
			LDFLAGS = $(OPT) -L. -L$(FFTW)/lib

			LIBS = -lfft -lfftw3

			.SUFFIXES:
			.SUFFIXES: .o .c .F90 .f90 .f

			.f90.o:
			$(F90) $(F90FLAGS) -c $<
			.F90.o:
			$(F90) $(F90FLAGS) -c $<
			.f.o:
			$(F90) $(F90FLAGS) -c $<

			all: tfft

			lib: libfft.a

			libfft.a: fft_fftw.o
			xiar r $@ $?
			ranlib $@

			tfft: tfft.o
			$(LD) $(LDFLAGS) -o $@ tfft.o fft_fftw.o $(LIBS)

			tfft.o: lib

			clean:
			rm -f .o .mod *~ a.out

			distclean: clean
			rm -f tfft