diff --git a/C_Tempate/.gitignore b/C_Tempate/.gitignore
new file mode 100644
index 0000000..bd461b5
--- /dev/null
+++ b/C_Tempate/.gitignore
@@ -0,0 +1,74 @@
+# Prerequisites
+*.d
+
+# Object files
+*.o
+*.ko
+*.obj
+*.elf
+
+# Linker output
+*.ilk
+*.map
+*.exp
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Libraries
+*.lib
+*.a
+*.la
+*.lo
+
+# Shared objects (inc. Windows DLLs)
+*.dll
+*.so
+*.so.*
+*.dylib
+
+# Executables
+*.exe
+*.out
+*.app
+*.i*86
+*.x86_64
+*.hex
+
+# Debug files
+*.dSYM/
+*.su
+*.idb
+*.pdb
+
+# Kernel Module Compile Results
+*.mod*
+*.cmd
+.tmp_versions/
+modules.order
+Module.symvers
+Mkfile.old
+dkms.conf
+
+# Vscode
+.vscode/
+
+# CMake
+CMakeLists.txt.user
+CMakeCache.txt
+CMakeFiles
+CMakeScripts
+Testing
+Makefile
+cmake_install.cmake
+install_manifest.txt
+compile_commands.json
+.cache/
+CTestTestfile.cmake
+_deps
+build/
+lib/
+bin/
+*.swp
+
diff --git a/C_Tempate/.vimspector.json b/C_Tempate/.vimspector.json
deleted file mode 100644
index d24574a..0000000
--- a/C_Tempate/.vimspector.json
+++ /dev/null
@@ -1,26 +0,0 @@
-{
-  "configurations": {
-    "Launch": {
-      "adapter": "vscode-cpptools",
-      "filetypes": [ "cpp", "c", "objc", "rust" ], // optional
-      "configuration": {
-        "request": "launch",
-        "program": "${workspaceRoot}/output/main",
-        //"args": [ "", "" ],
-        "cwd": "${workspaceRoot}/output",
-        //"environment": [ ... ],
-        "externalConsole": true,
-        "MIMode": "gdb"
-      }
-    },
-    "Attach": {
-      "adapter": "vscode-cpptools",
-      "filetypes": [ "cpp", "c", "objc", "rust" ], // optional
-      "configuration": {
-        "request": "attach",
-        "program": "${workspaceRoot}/output/main",
-        "MIMode": "gdb"
-      }
-    }
-  }
-}
diff --git a/C_Tempate/CMakeLists.txt b/C_Tempate/CMakeLists.txt
new file mode 100644
index 0000000..e64334e
--- /dev/null
+++ b/C_Tempate/CMakeLists.txt
@@ -0,0 +1,52 @@
+cmake_minimum_required(VERSION 3.14)
+# Generate compile_commands.json
+set(PROJECT_NAME cTemplate)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+# Turn on testing by default
+option(BUILD_TESTING "Build tests" ON)
+# Turn off coverage by default
+option(ENABLE_COVERAGE "Enable test coverage" ON)
+
+# Set C standard to C99
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99")
+
+# Set the project name and version number. This allows for a user of your
+project(${PROJECT_NAME} VERSION 0.1)
+set(${PROJECT_NAME} 0.1)
+
+# Function to prepend the subdirectory to source files in subdirectories
+FUNCTION(PREPEND var )
+   SET(listVar "")
+   FOREACH(f ${${var}})
+       LIST(APPEND listVar "${CMAKE_CURRENT_SOURCE_DIR}/${f}")
+   ENDFOREACH(f)
+   SET(${var} "${listVar}" PARENT_SCOPE)
+ENDFUNCTION(PREPEND)
+
+# After a normal build, we can specify the location of various outputs of the
+# build. We put executables and static libraries outside the build directory in
+# bin/ and lib/, respectively.
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/bin")
+set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/lib")
+
+# Include source code and headers. This calls the CMakeLists.txt in each
+# subdirectory. These can define their own libraries, executables, etc. as targets,
+# but here we define all exportable targets in the root CMakeLists.txt.
+add_subdirectory(src)
+add_subdirectory(include)
+
+# enable unit testing via "make test" once the code has been compiled.
+# TODO: Google Test
+
+if(BUILD_TESTING)
+   message("Testing enabled")
+   enable_testing()
+   add_subdirectory(tests)
+   target_include_directories(tests PRIVATE include)
+endif()
+
+# Add PROJECT_NAME as an executable target.
+add_executable(${PROJECT_NAME} ${SRC} ${INC})
+target_include_directories(${PROJECT_NAME} PRIVATE include)
+
diff --git a/C_Tempate/Makefile b/C_Tempate/Makefile
deleted file mode 100644
index 3f27a58..0000000
--- a/C_Tempate/Makefile
+++ /dev/null
@@ -1,91 +0,0 @@
-#
-# 'make'        build executable file 'main'
-# 'make clean'  removes all .o and executable files
-#
-
-# define the C compiler to use CC = gcc
-
-# define any compile-time flags
-# CFLAGS  := -std=c99 -Wall -Wextra -g -lm 
-CFLAGS  := -std=c99 -Wall -Wextra -g
-
-# define library paths in addition to /usr/lib
-#   if I wanted to include libraries not in /usr/lib I'd specify
-#   their path using -Lpath, something like:
-LFLAGS =
-
-# define output directory
-OUTPUT	:= output
-
-# define source directory
-SRC		:= src
-
-# define include directory
-INCLUDE	:= include
-
-# define lib directory
-LIB		:= lib
-
-ifeq ($(OS),Windows_NT)
-MAIN	:= main.exe
-SOURCEDIRS	:= $(SRC)
-INCLUDEDIRS	:= $(INCLUDE)
-LIBDIRS		:= $(LIB)
-FIXPATH = $(subst /,\,$1)
-RM			:= del /q /f
-MD	:= mkdir
-else
-MAIN	:= main
-SOURCEDIRS	:= $(shell find $(SRC) -type d)
-INCLUDEDIRS	:= $(shell find $(INCLUDE) -type d)
-LIBDIRS		:= $(shell find $(LIB) -type d)
-FIXPATH = $1
-RM = rm -f
-MD	:= mkdir -p
-endif
-
-# define any directories containing header files other than /usr/include
-INCLUDES	:= $(patsubst %,-I%, $(INCLUDEDIRS:%/=%))
-
-# define the C libs
-LIBS		:= $(patsubst %,-L%, $(LIBDIRS:%/=%))
-
-# define the C source files
-SOURCES		:= $(wildcard $(patsubst %,%/*.c, $(SOURCEDIRS)))
-
-# define the C object files 
-OBJECTS		:= $(SOURCES:.c=.o)
-
-#
-# The following part of the makefile is generic; it can be used to 
-# build any executable just by changing the definitions above and by
-# deleting dependencies appended to the file from 'make depend'
-#
-
-OUTPUTMAIN	:= $(call FIXPATH,$(OUTPUT)/$(MAIN))
-
-all: $(OUTPUT) $(MAIN)
-	@echo Executing 'all' complete!
-
-$(OUTPUT):
-	$(MD) $(OUTPUT)
-
-$(MAIN): $(OBJECTS) 
-	$(CC) $(INCLUDES) $(OBJECTS) $(LFLAGS) $(LIBS) -o $(OUTPUTMAIN) $(CFLAGS)
-
-# this is a suffix replacement rule for building .o's from .c's
-# it uses automatic variables $<: the name of the prerequisite of
-# the rule(a .c file) and $@: the name of the target of the rule (a .o file) 
-# (see the gnu make manual section about automatic variables)
-.c.o:
-	$(CC) $(CFLAGS) $(INCLUDES) -c $<  -o $@
-
-.PHONY: clean
-clean:
-	$(RM) $(OUTPUTMAIN)
-	$(RM) $(call FIXPATH,$(OBJECTS))
-	@echo Cleanup complete!
-
-run: all
-	./$(OUTPUTMAIN)
-	@echo Executing 'run: all' complete!
diff --git a/C_Tempate/include/CMakeLists.txt b/C_Tempate/include/CMakeLists.txt
new file mode 100644
index 0000000..15f3e7a
--- /dev/null
+++ b/C_Tempate/include/CMakeLists.txt
@@ -0,0 +1,16 @@
+
+# Make an explicit list of all source files in IFJ23_INC. This is important
+# because CMake is not a build system: it is a build system generator. Suppose
+# you add a file foo.cpp to src/ after running cmake .. . If you set
+# IFJ23_INC with `file(GLOB ... )`, this is not passed to the makefile; it
+# doesn't know that foo.cpp exists and will not re-run cmake. Your
+# collaborator's builds will fail and it will be unclear why. Whether you use
+# file(GLOB ...) or not, you will need to re-run cmake, but with an explicit
+# file list, you know beforehand why your code isn't compiling.
+set(INC
+    )
+
+# Form the full path to the source files...
+PREPEND(INC)
+# ... and pass the variable to the parent scope.
+set(INC ${INC}  PARENT_SCOPE)
diff --git a/C_Tempate/src/CMakeLists.txt b/C_Tempate/src/CMakeLists.txt
new file mode 100644
index 0000000..b91d51d
--- /dev/null
+++ b/C_Tempate/src/CMakeLists.txt
@@ -0,0 +1,17 @@
+
+# Make an explicit list of all source files in `CMakeDemo_SRC`. This is important
+# because CMake is not a build system: it is a build system generator. Suppose
+# you add a file foo.cpp to src/ after running cmake .. . If you set
+# `CMakeDemo_SRC` with `file(GLOB ... )`, this is not passed to the makefile;
+# the makefile doesn't know that foo.cpp exists and will not re-run cmake. Your
+# collaborator's builds will fail and it will be unclear why. Whether you use
+# file(GLOB ...) or not, you will need to re-run cmake, but with an explicit
+# file list, you know beforehand why your code isn't compiling.
+set(SRC
+    main.c
+    )
+
+# Form the full path to the source files...
+PREPEND(SRC)
+# ... and pass the variable to the parent scope.
+set(SRC ${SRC}  PARENT_SCOPE)
diff --git a/C_Tempate/src/main.c b/C_Tempate/src/main.c
index e8178a6..70ba1e7 100644
--- a/C_Tempate/src/main.c
+++ b/C_Tempate/src/main.c
@@ -1,8 +1,25 @@
-#include <stdio.h>
-#include <stdlib.h>
+/**
+ * Copyright [2023] Jiří Štefka <jiriks74>
+ * Project: AdventOfCode
+ * @file main.c
+ * @brief Main entry point
+ * @author jiriks74
+ */
 
+#include <stdio.h>
+
+/**
+ * @brief Main entry point
+ * @param argc Number of command-line arguments.
+ * @param argv Array of command-line arguments.
+ */
+#ifndef TESTING
 int main(int argc, char *argv[])
+#endif
+#ifdef TESTING
+    int main_test(int argc, char *argv[])
+#endif
 {
-    printf("Hello world!\n");
-    return 0;
+  printf("Hello world!\n");
+  return 0;
 }
diff --git a/C_Tempate/tests/CMakeLists.txt b/C_Tempate/tests/CMakeLists.txt
new file mode 100644
index 0000000..f2a2124
--- /dev/null
+++ b/C_Tempate/tests/CMakeLists.txt
@@ -0,0 +1,80 @@
+set(PROJECT_NAME ${PROJECT_NAME} PARENT_SCOPE )
+# GoogleTest requires at least C++14
+set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+# Get GoogleTest
+include(FetchContent)
+FetchContent_Declare(
+  googletest
+  URL https://github.com/google/googletest/archive/03597a01ee50ed33e9dfd640b249b4be3799d395.zip
+)
+# For Windows: Prevent overriding the parent project's compiler/linker settings
+set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+FetchContent_MakeAvailable(googletest)
+
+add_subdirectory(src)
+add_executable(tests ${TESTS})
+
+# Link test executable against gtest & gtest_main
+target_link_libraries(
+  tests
+  GTest::gtest_main
+)
+
+target_include_directories(tests PRIVATE
+  ${CMAKE_SOURCE_DIR}/src
+  )
+
+# Discover tests
+include(GoogleTest)
+gtest_discover_tests(tests)
+add_dependencies(tests ${PROJECT_NAME})
+
+# The following section is inspired by https://github.com/cmake-modules/lcov
+if(ENABLE_COVERAGE)
+  message("Test coverage enabled")
+  # set(exclude_dir "*/tests/*  */_deps/* /usr/include/c++/11/**/* /usr/include/c++/**/*")
+  # set(exclude_dir "*/tests/* */_deps/* /usr/include/c++/11/tuple /usr/include/c++/11/**/*")
+
+  # Check for lcov, gcov and genhtml
+  find_program(GCOV gcov)
+  if (NOT GCOV)
+    message(WARNING "gcov not found")
+  endif()
+  find_program(LCOV lcov)
+  if (NOT LCOV)
+    message(WARNING "lcov not found")
+  endif()
+  find_program(GENHTML genhtml)
+  if (NOT GENHTML)
+    message(WARNING "genhtml not found")
+  endif()
+
+  if (GCOV AND LCOV AND GENHTML)
+    # Set C compiler flags
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} --coverage -fprofile-arcs -ftest-coverage")
+    # Set C++ compiler flags
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --coverage -fprofile-arcs -ftest-coverage")
+
+    set(covname cov.info)
+    add_custom_target(coverage DEPENDS ${covname})
+    add_dependencies(coverage tests ${PROJECT_NAME})
+    add_custom_command(
+      OUTPUT  ${covname}
+      COMMAND ${LCOV} -c -o ${covname} -d ${CMAKE_BINARY_DIR}/tests/CMakeFiles/tests.dir/ -b . --gcov-tool ${GCOV}
+      COMMAND ${LCOV} -r ${covname} -o ${covname} "*/tests/*" "*/_deps/**/*" "/usr/include/c++/**/*" "/usr/include/c++/11/**/*"
+      COMMAND ${LCOV} -l ${covname}
+      COMMAND ${GENHTML} ${covname} -output coverage
+      COMMAND ${LCOV} -l ${covname} 2>/dev/null | grep Total | sed 's/|//g' | sed 's/Total://g' | awk '{print $1}' | sed s/%//g > coverage/total
+    )
+    set_directory_properties(PROPERTIES
+      ADDITIONAL_CLEAN_FILES ${covname}
+    )
+    set_directory_properties(PROPERTIES
+      ADDITIONAL_CLEAN_FILES coverage/
+    )
+  else()
+    message(WARNING "Cannot enable coverage. Missing the required tools")
+  endif()
+endif()
diff --git a/C_Tempate/tests/src/CMakeLists.txt b/C_Tempate/tests/src/CMakeLists.txt
new file mode 100644
index 0000000..227c709
--- /dev/null
+++ b/C_Tempate/tests/src/CMakeLists.txt
@@ -0,0 +1,17 @@
+
+# Make an explicit list of all source files in `IFJ23_TESTS`. This is important
+# because CMake is not a build system: it is a build system generator. Suppose
+# you add a file foo.cpp to src/ after running cmake .. . If you set
+# `IFJ23_TESTS` with `file(GLOB ... )`, this is not passed to the makefile;
+# the makefile doesn't know that foo.cpp exists and will not re-run cmake. Your
+# collaborator's builds will fail and it will be unclear why. Whether you use
+# file(GLOB ...) or not, you will need to re-run cmake, but with an explicit
+# file list, you know beforehand why your code isn't compiling.
+set(TESTS
+    test.cpp
+    )
+
+# Form the full path to the source files...
+PREPEND(TESTS)
+# ... and pass the variable to the parent scope.
+set(TESTS ${TESTS}  PARENT_SCOPE)
diff --git a/C_Tempate/tests/src/test.cpp b/C_Tempate/tests/src/test.cpp
new file mode 100644
index 0000000..37477b0
--- /dev/null
+++ b/C_Tempate/tests/src/test.cpp
@@ -0,0 +1,31 @@
+#include <gtest/gtest.h>
+
+#define TESTING
+
+// Include the source file(s) to be tested.
+#include "main.c"
+
+// Create a test fixture class template - this will be like a "conlection" of
+// tests. the : public ::testing::Test part is important! Add it to your fixture
+// class.
+class HelloTest : public ::testing::Test {
+  HelloTest() {}
+
+  ~HelloTest() {}
+
+  void SetUp() {}
+
+  void TearDown() {}
+};
+
+// Add tests to the test fixture class.
+// @param fixture_class_name The name of the test fixture class.
+// @param test_name The name of the test.
+TEST(HelloTest, BasicAssertions) {
+  // Execute the code to be tested.
+  // Expect two strings not to be equal.
+  EXPECT_STRNE("hello", "world");
+  // Expect equality.
+  EXPECT_EQ(7 * 6, 42);
+}
+