user: Demonstrate the C code that generates the assembly output below:

```asm
<count_perfect_matches_v2c>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %rbx
  sub    $0x1000,%rsp
  orq    $0x0,(%rsp)
  sub    $0x1000,%rsp
  orq    $0x0,(%rsp)
  sub    $0x758,%rsp
  mov    %rdi,-0x2748(%rbp)
  mov    %rsi,-0x2750(%rbp)
  mov    %rdx,-0x2758(%rbp)
  mov    %rcx,-0x2760(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x18(%rbp)
  xor    %eax,%eax
  movl   $0x0,-0x2740(%rbp)
  mov    -0x2750(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %eax,-0x273c(%rbp)
  mov    -0x2748(%rbp),%rdx
  lea    -0x2730(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcpy@plt>
  mov    -0x2750(%rbp),%rdx
  lea    -0x2730(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strstr@plt>
  mov    %rax,-0x2738(%rbp)
  jmp    L12
L54:
  mov    -0x2750(%rbp),%rdx
  lea    -0x2730(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strstr@plt>
  mov    %rax,-0x2738(%rbp)
  cmpq   $0x0,-0x2738(%rbp)
  je     L12
  addl   $0x1,-0x2740(%rbp)
  mov    -0x2740(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x2760(%rbp),%rax
  lea    (%rdx,%rax,1),%rbx
  mov    -0x2738(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %eax,(%rbx)
  mov    -0x273c(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x2738(%rbp),%rax
  add    %rax,%rdx
  lea    -0x2730(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcpy@plt>
L12:
  cmpq   $0x0,-0x2738(%rbp)
  jne    L54
  mov    -0x2748(%rbp),%rdx
  lea    -0x2730(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcpy@plt>
  mov    -0x2758(%rbp),%rdx
  lea    -0x2730(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strstr@plt>
  mov    %rax,-0x2738(%rbp)
  jmp    L38
L27:
  mov    -0x2758(%rbp),%rdx
  lea    -0x2730(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strstr@plt>
  mov    %rax,-0x2738(%rbp)
  cmpq   $0x0,-0x2738(%rbp)
  je     L38
  addl   $0x1,-0x2740(%rbp)
  mov    -0x2740(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x2760(%rbp),%rax
  lea    (%rdx,%rax,1),%rbx
  mov    -0x2738(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %eax,(%rbx)
  mov    -0x273c(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x2738(%rbp),%rax
  add    %rax,%rdx
  lea    -0x2730(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcpy@plt>
L38:
  cmpq   $0x0,-0x2738(%rbp)
  jne    L27
  mov    -0x2740(%rbp),%eax
  mov    -0x18(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L48
  call   <__stack_chk_fail@plt>
L48:
  mov    -0x8(%rbp),%rbx
  leave
  ret
```

assistant: ```c
int count_perfect_matches_v2c(char *upstream_sequence, char *motif, char *motifc, int *pos) {
  char *search_string;
  char current_string[10000];
  int n = 0;
  int motif_length;
  motif_length = strlen(motif);
  strcpy(current_string, upstream_sequence);
  search_string = strstr(current_string, motif);
  while (search_string != NULL) {
    search_string = strstr(current_string, motif);
    if (search_string != NULL) {
      n++;
      pos[n] = strlen(search_string);
      strcpy(current_string, search_string + motif_length);
    }
  }
  strcpy(current_string, upstream_sequence);
  search_string = strstr(current_string, motifc);
  while (search_string != NULL) {
    search_string = strstr(current_string, motifc);
    if (search_string != NULL) {
      n++;
      pos[n] = strlen(search_string);
      strcpy(current_string, search_string + motif_length);
    }
  }
  return n;
}
```