diff --git a/week4/day4.ipynb b/week4/day4.ipynb
index 32f4ffb..e8c0419 100644
--- a/week4/day4.ipynb
+++ b/week4/day4.ipynb
@@ -453,101 +453,6 @@
     "ui.launch(inbrowser=True)"
    ]
   },
-  {
-   "cell_type": "code",
-   "execution_count": 113,
-   "id": "e42286bc-085c-45dc-b101-234308e58269",
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "import platform\n",
-    "\n",
-    "VISUAL_STUDIO_2022_TOOLS = \"C:\\\\Program Files\\\\Microsoft Visual Studio\\\\2022\\\\Community\\\\Common7\\Tools\\\\VsDevCmd.bat\"\n",
-    "VISUAL_STUDIO_2019_TOOLS = \"C:\\\\Program Files (x86)\\\\Microsoft Visual Studio\\\\2019\\\\BuildTools\\\\Common7\\\\Tools\\\\VsDevCmd.bat\"\n",
-    "\n",
-    "simple_cpp = \"\"\"\n",
-    "#include <iostream>\n",
-    "\n",
-    "int main() {\n",
-    "    std::cout << \"Hello\";\n",
-    "    return 0;\n",
-    "}\n",
-    "\"\"\"\n",
-    "\n",
-    "def run_cmd(command_to_run):\n",
-    "    try:\n",
-    "        run_result = subprocess.run(command_to_run, check=True, text=True, capture_output=True)\n",
-    "        return run_result.stdout if run_result.stdout else \"SUCCESS\"\n",
-    "    except:\n",
-    "        return \"\"\n",
-    "\n",
-    "def c_compiler_cmd(filename_base):\n",
-    "    my_platform = platform.system()\n",
-    "    my_compiler = []\n",
-    "\n",
-    "    try:\n",
-    "        with open(\"simple.cpp\", \"w\") as f:\n",
-    "            f.write(simple_cpp)\n",
-    "            \n",
-    "        if my_platform == \"Windows\":\n",
-    "            if os.path.isfile(VISUAL_STUDIO_2022_TOOLS):\n",
-    "                if os.path.isfile(\"./simple.exe\"):\n",
-    "                    os.remove(\"./simple.exe\")\n",
-    "                compile_cmd = [\"cmd\", \"/c\", VISUAL_STUDIO_2022_TOOLS, \"&\", \"cl\", \"simple.cpp\"]\n",
-    "                if run_cmd(compile_cmd):\n",
-    "                    if run_cmd([\"./simple\"]) == \"Hello\":\n",
-    "                        my_compiler = [\"Windows\", \"Visual Studio 2022\", [\"cmd\", \"/c\", VISUAL_STUDIO_2022_TOOLS, \"&\", \"cl\", f\"{filename_base}.cpp\"]]\n",
-    "        \n",
-    "            if not my_compiler:\n",
-    "                if os.path.isfile(VISUAL_STUDIO_2019_TOOLS):\n",
-    "                    if os.path.isfile(\"./simple.exe\"):\n",
-    "                        os.remove(\"./simple.exe\")\n",
-    "                    compile_cmd = [\"cmd\", \"/c\", VISUAL_STUDIO_2019_TOOLS, \"&\", \"cl\", \"simple.cpp\"]\n",
-    "                    if run_cmd(compile_cmd):\n",
-    "                        if run_cmd([\"./simple\"]) == \"Hello\":\n",
-    "                            my_compiler = [\"Windows\", \"Visual Studio 2019\", [\"cmd\", \"/c\", VISUAL_STUDIO_2019_TOOLS, \"&\", \"cl\", f\"{filename_base}.cpp\"]]\n",
-    "    \n",
-    "            if not my_compiler:\n",
-    "                my_compiler=[my_platform, \"Unavailable\", []]\n",
-    "                \n",
-    "        elif my_platform == \"Linux\":\n",
-    "            if os.path.isfile(\"./simple\"):\n",
-    "                os.remove(\"./simple\")\n",
-    "            compile_cmd = [\"g++\", \"simple.cpp\", \"-o\", \"simple\"]\n",
-    "            if run_cmd(compile_cmd):\n",
-    "                if run_cmd([\"./simple\"]) == \"Hello\":\n",
-    "                    my_compiler = [\"Linux\", \"GCC\", [\"g++\", f\"{filename_base}.cpp\", \"-o\", f\"{filename_base}\" ]]\n",
-    "    \n",
-    "            if not my_compiler:\n",
-    "                if os.path.isfile(\"./simple\"):\n",
-    "                    os.remove(\"./simple\")\n",
-    "                compile_cmd = [\"clang\", \"simple.cpp\", \"-o\", \"simple\"]\n",
-    "                if run_cmd(compile_cmd):\n",
-    "                    if run_cmd([\"./simple\"]) == \"Hello\":\n",
-    "                        my_compiler = [\"Linux\", \"CLang\", [\"clang\", f\"{filename_base}.cpp\", \"-o\", f\"{filename_base}\"]]\n",
-    "        \n",
-    "            if not my_compiler:\n",
-    "                my_compiler=[my_platform, \"Unavailable\", []]\n",
-    "    \n",
-    "        elif my_platform == \"Darwin\":\n",
-    "            if os.path.isfile(\"./simple\"):\n",
-    "                os.remove(\"./simple\")\n",
-    "            compile_cmd = [\"gcc\", \"simple.cpp\"]\n",
-    "            if run_cmd(compile_cmd):\n",
-    "                if run_cmd([\"./simple\"]) == \"Hello\":\n",
-    "                    my_compiler = [\"Linux\", \"CLang\", [\"clang++\", \"-Ofast\", \"-std=c++17\", \"-march=armv8.5-a\", \"-mtune=apple-m1\", \"-mcpu=apple-m1\", \"-o\", f\"{filename_base}\", f\"{filename_base}.cpp\"]]\n",
-    "    \n",
-    "            if not my_compiler:\n",
-    "                my_compiler=[my_platform, \"Unavailable\", []]\n",
-    "    except:\n",
-    "        my_compiler=[my_platform, \"Unavailable\", []]\n",
-    "        \n",
-    "    if my_compiler:\n",
-    "        return my_compiler\n",
-    "    else:\n",
-    "        return [\"Unknown\", \"Unavailable\", []]\n"
-   ]
-  },
   {
    "cell_type": "code",
    "execution_count": null,
@@ -751,6 +656,101 @@
     "        return \"Type your Python program here\""
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 113,
+   "id": "e42286bc-085c-45dc-b101-234308e58269",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import platform\n",
+    "\n",
+    "VISUAL_STUDIO_2022_TOOLS = \"C:\\\\Program Files\\\\Microsoft Visual Studio\\\\2022\\\\Community\\\\Common7\\Tools\\\\VsDevCmd.bat\"\n",
+    "VISUAL_STUDIO_2019_TOOLS = \"C:\\\\Program Files (x86)\\\\Microsoft Visual Studio\\\\2019\\\\BuildTools\\\\Common7\\\\Tools\\\\VsDevCmd.bat\"\n",
+    "\n",
+    "simple_cpp = \"\"\"\n",
+    "#include <iostream>\n",
+    "\n",
+    "int main() {\n",
+    "    std::cout << \"Hello\";\n",
+    "    return 0;\n",
+    "}\n",
+    "\"\"\"\n",
+    "\n",
+    "def run_cmd(command_to_run):\n",
+    "    try:\n",
+    "        run_result = subprocess.run(command_to_run, check=True, text=True, capture_output=True)\n",
+    "        return run_result.stdout if run_result.stdout else \"SUCCESS\"\n",
+    "    except:\n",
+    "        return \"\"\n",
+    "\n",
+    "def c_compiler_cmd(filename_base):\n",
+    "    my_platform = platform.system()\n",
+    "    my_compiler = []\n",
+    "\n",
+    "    try:\n",
+    "        with open(\"simple.cpp\", \"w\") as f:\n",
+    "            f.write(simple_cpp)\n",
+    "            \n",
+    "        if my_platform == \"Windows\":\n",
+    "            if os.path.isfile(VISUAL_STUDIO_2022_TOOLS):\n",
+    "                if os.path.isfile(\"./simple.exe\"):\n",
+    "                    os.remove(\"./simple.exe\")\n",
+    "                compile_cmd = [\"cmd\", \"/c\", VISUAL_STUDIO_2022_TOOLS, \"&\", \"cl\", \"simple.cpp\"]\n",
+    "                if run_cmd(compile_cmd):\n",
+    "                    if run_cmd([\"./simple\"]) == \"Hello\":\n",
+    "                        my_compiler = [\"Windows\", \"Visual Studio 2022\", [\"cmd\", \"/c\", VISUAL_STUDIO_2022_TOOLS, \"&\", \"cl\", f\"{filename_base}.cpp\"]]\n",
+    "        \n",
+    "            if not my_compiler:\n",
+    "                if os.path.isfile(VISUAL_STUDIO_2019_TOOLS):\n",
+    "                    if os.path.isfile(\"./simple.exe\"):\n",
+    "                        os.remove(\"./simple.exe\")\n",
+    "                    compile_cmd = [\"cmd\", \"/c\", VISUAL_STUDIO_2019_TOOLS, \"&\", \"cl\", \"simple.cpp\"]\n",
+    "                    if run_cmd(compile_cmd):\n",
+    "                        if run_cmd([\"./simple\"]) == \"Hello\":\n",
+    "                            my_compiler = [\"Windows\", \"Visual Studio 2019\", [\"cmd\", \"/c\", VISUAL_STUDIO_2019_TOOLS, \"&\", \"cl\", f\"{filename_base}.cpp\"]]\n",
+    "    \n",
+    "            if not my_compiler:\n",
+    "                my_compiler=[my_platform, \"Unavailable\", []]\n",
+    "                \n",
+    "        elif my_platform == \"Linux\":\n",
+    "            if os.path.isfile(\"./simple\"):\n",
+    "                os.remove(\"./simple\")\n",
+    "            compile_cmd = [\"g++\", \"simple.cpp\", \"-o\", \"simple\"]\n",
+    "            if run_cmd(compile_cmd):\n",
+    "                if run_cmd([\"./simple\"]) == \"Hello\":\n",
+    "                    my_compiler = [\"Linux\", \"GCC (g++)\", [\"g++\", f\"{filename_base}.cpp\", \"-o\", f\"{filename_base}\" ]]\n",
+    "    \n",
+    "            if not my_compiler:\n",
+    "                if os.path.isfile(\"./simple\"):\n",
+    "                    os.remove(\"./simple\")\n",
+    "                compile_cmd = [\"clang++\", \"simple.cpp\", \"-o\", \"simple\"]\n",
+    "                if run_cmd(compile_cmd):\n",
+    "                    if run_cmd([\"./simple\"]) == \"Hello\":\n",
+    "                        my_compiler = [\"Linux\", \"CLang (Clang++)\", [\"clang++\", f\"{filename_base}.cpp\", \"-o\", f\"{filename_base}\"]]\n",
+    "        \n",
+    "            if not my_compiler:\n",
+    "                my_compiler=[my_platform, \"Unavailable\", []]\n",
+    "    \n",
+    "        elif my_platform == \"Darwin\":\n",
+    "            if os.path.isfile(\"./simple\"):\n",
+    "                os.remove(\"./simple\")\n",
+    "            compile_cmd = [\"gcc\", \"simple.cpp\"]\n",
+    "            if run_cmd(compile_cmd):\n",
+    "                if run_cmd([\"./simple\"]) == \"Hello\":\n",
+    "                    my_compiler = [\"Linux\", \"CLang\", [\"clang++\", \"-Ofast\", \"-std=c++17\", \"-march=armv8.5-a\", \"-mtune=apple-m1\", \"-mcpu=apple-m1\", \"-o\", f\"{filename_base}\", f\"{filename_base}.cpp\"]]\n",
+    "    \n",
+    "            if not my_compiler:\n",
+    "                my_compiler=[my_platform, \"Unavailable\", []]\n",
+    "    except:\n",
+    "        my_compiler=[my_platform, \"Unavailable\", []]\n",
+    "        \n",
+    "    if my_compiler:\n",
+    "        return my_compiler\n",
+    "    else:\n",
+    "        return [\"Unknown\", \"Unavailable\", []]\n"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,