Add the CLion practice projects

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

untitled/CMakeLists.txt

@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.14)
+project(untitled C)
+
+set(CMAKE_C_STANDARD 11)
+
+add_library(untitled library.c library.h)

untitled/library.c

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

untitled/library.h

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