diff --git a/work/week12/starting_point/CMakeLists.txt b/work/week12/starting_point/CMakeLists.txt
index ab3c469..67e7652 100644
--- a/work/week12/starting_point/CMakeLists.txt
+++ b/work/week12/starting_point/CMakeLists.txt
@@ -1,92 +1,94 @@
 cmake_minimum_required (VERSION 3.1)
 project (Particles)
 cmake_policy(VERSION 3.3)
 
 set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${PROJECT_SOURCE_DIR}/cmake")
 
 ################################################################
 # libpart
 ################################################################
 
 add_library(part
   compute_boundary.cc
   compute_verlet_integration.cc
   particle.cc
   planet.cc
   compute_gravity.cc
   csv_reader.cc
   particles_factory_interface.cc
   planets_factory.cc
   compute_contact.cc
   compute_kinetic_energy.cc
   csv_writer.cc
   system.cc
   compute_energy.cc
   compute_potential_energy.cc
   ping_pong_ball.cc
   material_point.cc
   system_evolution.cc
   ping_pong_balls_factory.cc
   compute_interaction.cc
   compute_temperature.cc
   material_points_factory.cc
   )
 
 
+################################################################
+# FFTW
+################################################################
+
+
+set(FFTW_LIBRARY_PATH CACHE PATH "library where to search FFTW")
+find_library (FFTW_LIBRARY fftw3 /usr/include/ ${FFTW_LIBRARY_PATH})
+
+option (USE_FFTW "Use FFTW library" ON)
+
+if (USE_FFTW)
+    target_link_libraries (part ${FFTW_LIBRARY})
+endif (USE_FFTW)
 
+################################################################
 # Create executable
+################################################################
+
 add_executable(particles main.cc)
 target_link_libraries(particles part)
 
 
+
+
 ################################################################
 # Google test
 ################################################################
 
 
 include(GoogleTest)
 enable_testing()
 find_package(GTest)
 if (GTEST_FOUND)
 include_directories(${GTEST_INCLUDE_DIRS})
 add_executable(test_kepler test_kepler.cc)
 add_executable(test_fft test_fft.cc)
 target_link_libraries(test_kepler part ${GTEST_BOTH_LIBRARIES} pthread)
 target_link_libraries(test_fft part ${GTEST_BOTH_LIBRARIES} ${FFTW_LIBRARIES} pthread)
 gtest_discover_tests(test_kepler)
 gtest_discover_tests(test_fft)
 endif()
 
-################################################################
-# FFTW
-################################################################
-
-
-set(FFTW_LIBRARY_PATH CACHE PATH "library where to search FFTW")
-find_library (FFTW_LIBRARY fftw3 /usr/include/ ${FFTW_LIBRARY_PATH})
-
-option (USE_FFTW "Use FFTW library" ON)
-
-if (USE_FFTW)
-    target_link_libraries (particles ${FFTW_LIBRARY})
-    target_link_libraries (test_fft ${FFTW_LIBRARY})
-endif (USE_FFTW)
-
-
 
 ################################################################
 # Doxygen
 ################################################################
 
 find_package(Doxygen)
 if (DOXYGEN_FOUND)
 
 # to set other options, read: https://cmake.org/cmake/help/v3.9/module/FindDoxygen.html
 doxygen_add_docs(
     doxygen
     ${PROJECT_SOURCE_DIR}
     COMMENT "Generate html pages"
 )
 add_custom_target(doc DEPENDS doxygen)
 endif(DOXYGEN_FOUND)