AOC2023: Implement day12

There seems to be a problem with my malloc so the hash map is not
working. This code worked fine on my linux with actually working
malloc :D

userspace/aoc2023/day12/CMakeLists.txt

@@ -0,0 +1,22 @@
+cmake_minimum_required(VERSION 3.26)
+
+project(aoc2023_day12 CXX)
+
+set(SOURCES
+	main.cpp
+)
+
+add_executable(aoc2023_day12 ${SOURCES})
+target_compile_options(aoc2023_day12 PUBLIC -O2 -g)
+target_link_libraries(aoc2023_day12 PUBLIC libc ban)
+
+add_dependencies(aoc2023_day12 libc-install ban-install)
+
+add_custom_target(aoc2023_day12-install
+	COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_BINARY_DIR}/aoc2023_day12 ${BANAN_AOC2023_BIN}/day12
+	DEPENDS aoc2023_day12
+	DEPENDS aoc2023_always
+)
+
+add_dependencies(aoc2023 aoc2023_day12)
+add_dependencies(aoc2023-install aoc2023_day12-install)