Add the CLion practice projects

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

untitled2/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16)
+project(untitled2 C)
+
+set(CMAKE_C_STANDARD 99)
+
+add_library(untitled2 library.c library.h)

untitled2/library.c

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+#include "library.h"
+
+#include <stdio.h>
+
+void hello(void) {
+    printf("Hello, World!\n");
+}

untitled2/library.h

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+#ifndef UNTITLED2_LIBRARY_H
+#define UNTITLED2_LIBRARY_H
+
+void hello(void);
+
+#endif //UNTITLED2_LIBRARY_H