fix: bunch of meaningless chars in the walkthrough/source code

level9: done (wip - walkthrough)

level3/walkthrough

@@ -1,7 +1,7 @@
 # Level3
 
-Using ghidra, we can decompile the code and see that it fills a buffer of 520 bytes using `fgets`.
-This buffer will then be passed directly as a parameter to `printf`. This allows us to print whatever we want (e.g dump the stack, change variables).
+Using ghidra, we can decompile the code and see that it fills a buffer of 520 bytes using `fgets()`.
+This buffer will then be passed directly as a parameter to `printf()`. This allows us to print whatever we want (e.g dump the stack, change variables).
 We can see in the decompiled code that a global variable `m` exists. The program will execute a `system("/bin/sh")` if `m == 64`.
 Our goal here will be to change the value of this variable in order to get the password.