[Add] Initial project structure.

.gitignore

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+# Build output.
+bin/
+build/
+
+# Editor/IDE, whatever people use.
+.vscode/
+.idea/
+*.suo
+*.user
+*.clangd/
+
+# For those messy OS'es that like to put files everywhere.
+.DS_Store
+
+# Misc.
+assets/design_doc.org
+.clangd
+*.swp

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16)
+project(bettola CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+add_subdirectory(common)
+add_subdirectory(client)
+add_subdirectory(server)

Makefile

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+# Wrapper Makefile.
+
+# Build artifacts.
+BUILD_DIR := bin
+
+# Client path.
+CLIENT_EXE := $(BUILD_DIR)/client/bettolac
+# Server path.
+SERVER_EXE := $(BUILD_DIR)/server/bettolas
+
+.PHONY: all build config runc runs clean
+
+# Default target when running 'make'.
+all: build
+
+build: config
+	@echo "=== Building Bettola. ==="
+	@$(MAKE) -C $(BUILD_DIR)
+
+config:
+	@echo "=== Configuring Project. ==="
+	@cmake -B $(BUILD_DIR) -S .
+
+runc: build
+	@echo "=== Running Bettola Client. ==="
+	@$(CLIENT_EXE)
+
+runs: build
+	@echo "=== Running Bettola Server. ==="
+	@$(SERVER_EXE)
+
+clean:
+	@echo "=== Cleaning Build Directory. ==="
+	@rm -rf $(BUILD_DIR)

client/CMakeLists.txt

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+file(GLOB_RECURSE CLIENT_SOURCES "src/*.cpp")
+
+add_executable(bettolac
+  ${CLIENT_SOURCES}
+)
+
+target_link_libraries(bettolac PRIVATE bettola)

client/src/main.cpp

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+#include "bettola.h"
+
+int main(int argc, char** argv) {
+  bettola_function();
+  return 0;
+}

common/CMakeLists.txt

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+file(GLOB_RECURSE BETTOLA_SOURCES "src/*.cpp")
+
+add_library(bettola
+  ${BETTOLA_SOURCES}
+)
+
+target_include_directories(bettola PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/src)
+

common/src/bettola.cpp

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+#include <cstdio>
+#include "bettola.h"
+
+void bettola_function(void) {
+  printf("Hello from libbettola!\n");
+}

common/src/bettola.h

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+#pragma once
+
+void bettola_function(void);

server/CMakeLists.txt

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+file(GLOB_RECURSE BETTOLAS_SOURCES "src/*.cpp")
+
+add_executable(bettolas
+  ${BETTOLAS_SOURCES}
+)
+
+target_link_libraries(bettolas PRIVATE bettola)
+

server/src/main.cpp

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+#include <cstdio>
+#include "bettola.h"
+
+int main(int argc, char** argv) {
+  printf("=== Server starting ===\n");
+  bettola_function();
+  return 0;
+}