Implemented shutdown & reboot

include/power.hpp

@@ -8,17 +8,42 @@ namespace Power
     class Power
     {
     private:
-        // specific for 64 and 32 bit
-        void *acpi;
-        void *dsdt;
-        void *madt;
+        void *acpi = nullptr;
+        void *dsdt = nullptr;
+        void *madt = nullptr;
 
     public:
+        /**
+         * @brief Get Advanced Configuration and Power Interface. (Available only on x32 and x64)
+         *
+         * @return void*
+         */
         void *GetACPI() { return this->acpi; }
+
+        /**
+         * @brief Get Differentiated System Description Table. (Available only on x32 and x64)
+         *
+         * @return void*
+         */
         void *GetDSDT() { return this->dsdt; }
+
+        /**
+         * @brief Get Multiple APIC Description Table. (Available only on x32 and x64)
+         *
+         * @return void*
+         */
         void *GetMADT() { return this->madt; }
+
+        /**
+         * @brief Reboot the system.
+         */
         void Reboot();
+
+        /**
+         * @brief Shutdown the system.
+         */
         void Shutdown();
+
         Power();
         ~Power();
     };