Move file to attachments

content/writeups/google-ctf/2021/beginners-quest/4.md

@@ -28,16 +28,6 @@ You’re taking a stroll in the lab, when Dr. Klostermann is calling your name:
 
 [attachment.zip](/files/writeups/google-ctf/2021/beginners-quest/4/attachment.zip)
 
-## Recon
-
-When opening the attachment, we can find two files: `chal.c` and `pico.uf2`.
-
-Before this challenge I had never heard of a `uf2` file, but from googling "pico.uf2", I found that it is probably a firmware file for the Paspberry Pi Pico.
-
-While I would have loved to play around with that, I didn't have one at hand. So we'll have to do with the `chal.c` file (which is probably the file running in the firmware).
-
-### `chal.c`
-
 {{< code language="c" title="chal.c" isCollapsed="true" >}}
 
 ```c
@@ -205,6 +195,16 @@ int main(void)
 
 {{< /code >}}
 
+## Recon
+
+When opening the attachment, we can find two files: `chal.c` and `pico.uf2`.
+
+Before this challenge I had never heard of a `uf2` file, but from googling "pico.uf2", I found that it is probably a firmware file for the Paspberry Pi Pico.
+
+While I would have loved to play around with that, I didn't have one at hand. So we'll have to do with the `chal.c` file (which is probably the file running in the firmware).
+
+### `chal.c`
+
 In this code, we see a lot of calls to the functions `gpio_set_mask()` and `gpio_clr_mask()`. When looking up what these to, we find [this documentation](https://raspberrypi.github.io/pico-sdk-doxygen/group__hardware__gpio.html):
 
 {{< figure src="/img/writeups/google-ctf/2021/beginners-quest/4/doc-functions.png" title="Functions documentation" >}}