I am trying to translate the following:

Action:
  push    %ebp                           #function prolog
  mov     %esp, %ebp
  sub     $0x10, %esp

  mov     0x8(%ebp), %eax                #first line compiles to these 4 lines
  imul    0x8(%ebp), %eax
  sub     $0x7, %eax
  mov     %eax, -0x4(%ebp)

  addl    $0x8, 0xc(%ebp)                 #second line

  mov     -0x4(%ebp), %eax                #third line
  mov     0xc(%ebp), %edx
  mov     (%edx, %eax, 4), %eax
  add     $0x3, %eax
  movb    $0x41, (%eax)

  leave
  ret

So far I have the following:

  //What am I missing?
  void Action(int x, char **y)
  {
       int z = x * x - 7;
       y+=8;
       //missing third line
  }

What is the best way to translate this?