Move the solver code to its own library

CMakeLists.txt

@@ -5,11 +5,14 @@ project(Sudoku)
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
-set(SOURCE_FILES
+set(LIB_SOURCE_FILES
   solver/cell.cpp
   solver/puzzle.cpp
   solver/solver.cpp
-  solver.cpp
 )
 
-add_executable(solver ${SOURCE_FILES})
+add_library(solver ${LIB_SOURCE_FILES})
+target_include_directories(solver PUBLIC "${PROJECT_SOURCE_DIR}")
+
+add_executable(test_solver solver.cpp)
+target_link_libraries(test_solver PUBLIC solver)

solver/cell.cpp

@@ -1,4 +1,4 @@
-#include "cell.h"
+#include "solver/cell.h"
 
 #include <algorithm>
 #include <cassert>

solver/puzzle.cpp

@@ -1,4 +1,4 @@
-#include "puzzle.h"
+#include "solver/puzzle.h"
 
 #include <algorithm>
 #include <cassert>

solver/puzzle.h

@@ -3,7 +3,7 @@
 #include <optional>
 #include <string>
 
-#include "cell.h"
+#include "solver/cell.h"
 
 class Puzzle {
  public:

solver/solver.cpp

@@ -1,4 +1,4 @@
-#include "solver.h"
+#include "solver/solver.h"
 
 #include <sstream>
 

solver/solver.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include "puzzle.h"
+#include "solver/puzzle.h"
 
 class Solver {
  public: