Update CMakeFiles, add initial pair potential implementation and tests

CMakeLists.txt

@@ -1,5 +1,6 @@
 cmake_minimum_required(VERSION 3.9)
-project(cudaCAC LANGUAGES CUDA CXX)
+set(NAME "cudaCAC")
+project(${NAME} LANGUAGES CUDA CXX)
 
 enable_testing()
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
@@ -12,7 +13,6 @@ set(CMAKE_CUDA_ARCHITECTURES 61)
 set(CUDA_SEPARABLE_COMPILATION ON)
 
 # Add Vec3  as a dependency
-add_subdirectory(tests)
 include(FetchContent)
 FetchContent_Declare(Vec3
     GIT_REPOSITORY https://www.alexselimov.com/git/aselimov/Vec3.git
@@ -30,16 +30,17 @@ include_directories(/usr/local/cuda-12.8/include)
 
 add_subdirectory(src)
 add_subdirectory(kernels)
+add_subdirectory(tests)
 
-add_executable(${CMAKE_PROJECT_NAME} main.cpp)
+add_executable(${NAME} main.cpp)
 install(DIRECTORY src/ DESTINATION src/)
 
 
 target_link_libraries(
-    ${CMAKE_PROJECT_NAME} 
+    ${NAME} 
     PRIVATE
-    ${CMAKE_PROJECT_NAME}_lib 
-    ${CMAKE_PROJECT_NAME}_cuda_lib 
+    ${NAME}_lib 
+    ${NAME}_cuda_lib 
     
     ${CUDA_LIBRARIES}
 )