Replace CMakeLists.txt with some proper structure.

CMakeLists.txt

 cmake_minimum_required(VERSION 3.15)
-project(pa2_2019_lab)
+project(pa2-2019-lab)
 set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -pedantic")
-add_subdirectory(lab/01/1-trains)
-add_subdirectory(lab/01/2-files)
-
-add_subdirectory(bug-hunt/01/1-pi_calculator)
-add_subdirectory(bug-hunt/01/2-warehouse)
-add_subdirectory(bug-hunt/01/3-veclib)
-
-add_subdirectory(homework/01/1-numbers)
-add_subdirectory(homework/01/2-array)
-add_subdirectory(homework/01/3-knapsack)
+add_subdirectory(lab)
+add_subdirectory(bug-hunt)
+add_subdirectory(homework)

bug-hunt/01/CMakeLists.txt

+add_subdirectory(1-pi_calculator)
+add_subdirectory(2-warehouse)
+add_subdirectory(3-veclib)

bug-hunt/CMakeLists.txt

+add_subdirectory(01)

homework/01/CMakeLists.txt

+add_subdirectory(1-numbers)
+add_subdirectory(2-array)
+add_subdirectory(3-knapsack)

homework/CMakeLists.txt

+add_subdirectory(01)

lab/01/CMakeLists.txt

+add_subdirectory(1-trains)
+add_subdirectory(2-files)

lab/CMakeLists.txt

+add_subdirectory(01)