How does the article ensure the shellcode's entry function executes correctly after extraction?

The article emphasizes that the entry function (`shell_code()`) must be defined before any other sub-functions in the source file. During compilation and extraction, the machine code for the entry function will occupy the first contiguous address range. When loading the shellcode via a function pointer like `(*(int(*)()) sc)()`, execution starts at the beginning, ensuring proper flow. This ordering is critical for reliable shellcode execution.