user: Please show me the C implementation that matches the assembly code listed below:

```asm
<main>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x20,%rsp
  mov    %edi,-0x14(%rbp)
  mov    %rsi,-0x20(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  mov    $0x0,%eax
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L7
  call   <__stack_chk_fail@plt>
L7:
  leave
  ret
```

assistant: ```c
int main(int argc, const char **argv) {
  unsigned long res;
  return 0;
  if (__builtin_mul_overflow((unsigned long)0x0, (unsigned long)0x0, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned long)0x0, (unsigned long)0x7FFFFFFFFFFFFFFF, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned long)0x0, (unsigned long)0x8000000000000000, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned long)0x1, (unsigned long)0x7FFFFFFFFFFFFFFF, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned long)0x1, (unsigned long)0x8000000000000000, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned long)0x2, (unsigned long)0x3FFFFFFFFFFFFFFF, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned long)0x2, (unsigned long)0xC000000000000000, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned long)0x2, (unsigned long)0x7FFFFFFFFFFFFFFF, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned long)0x2, (unsigned long)0x8000000000000000, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned long)0x4, (unsigned long)0x7FFFFFFFFFFFFFFF, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned long)0x4, (unsigned long)0x8000000000000000, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned long)0x0F, (unsigned long)0x8, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned long)0x1000000000000000, (unsigned long)0x8, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned long)0x1000000000000000, (unsigned long)0x1000000000000000, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned long)0x7FFFFFFFFFFFFFFF, (unsigned long)0x0, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned long)0x7FFFFFFFFFFFFFFF, (unsigned long)0x1, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned long)0x7FFFFFFFFFFFFFFF, (unsigned long)0x2, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned long)0x7FFFFFFFFFFFFFFF, (unsigned long)0x4, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned long)0x7FFFFFFFFFFFFFFF, (unsigned long)0x7FFFFFFFFFFFFFFF, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned long)0x7FFFFFFFFFFFFFFF, (unsigned long)0x8000000000000000, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned long)0x8000000000000000, (unsigned long)0x0, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned long)0x8000000000000000, (unsigned long)0x1, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned long)0x8000000000000000, (unsigned long)0x2, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned long)0x8000000000000000, (unsigned long)0x7FFFFFFFFFFFFFFF, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned long)0x8000000000000000, (unsigned long)0x8000000000000000, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned long)0xFFFFFFFFFFFFFFFF, (unsigned long)0x0, &res)) {
    return -1;
  }
  if (res != 0x0) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned long)0xFFFFFFFFFFFFFFFF, (unsigned long)0x1, &res)) {
    return -1;
  }
  if (res != 0xFFFFFFFFFFFFFFFF) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned long)0xFFFFFFFFFFFFFFFF, (unsigned long)0xFFFFFFFFFFFFFFFF, &res)) {
    return -1;
  }
  return 0;
}
```