user: 请将以下的汇编代码转换成C语言代码:

```asm
<test_slice_negative_offset>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x30,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  movabs $0x6765202c6d617073,%rax
  movabs $0x20646e61202c7367,%rdx
  mov    %rax,-0x20(%rbp)
  mov    %rdx,-0x18(%rbp)
  movl   $0x6d6168,-0x10(%rbp)
  lea    -0x20(%rbp),%rax
  mov    $0x9,%edx
  mov    $0xfffffffd,%esi
  mov    %rax,%rdi
  call   <pl_slice@plt>
  mov    %rax,-0x28(%rbp)
  mov    -0x28(%rbp),%rax
  lea    D97(%rip),%rdx
  mov    %rdx,%rcx
  lea    D65(%rip),%rdx
  mov    %rax,%rsi
  mov    $0x0,%edi
  call   <assert_equal_str@plt>
  lea    -0x20(%rbp),%rax
  mov    $0x9,%edx
  mov    $0xffffffff,%esi
  mov    %rax,%rdi
  call   <pl_slice@plt>
  mov    %rax,-0x28(%rbp)
  mov    -0x28(%rbp),%rax
  lea    D42(%rip),%rdx
  mov    %rdx,%rcx
  lea    D65(%rip),%rdx
  mov    %rax,%rsi
  mov    $0x0,%edi
  call   <assert_equal_str@plt>
  lea    -0x20(%rbp),%rax
  mov    $0x9,%edx
  mov    $0xfffffff7,%esi
  mov    %rax,%rdi
  call   <pl_slice@plt>
  mov    %rax,-0x28(%rbp)
  mov    -0x28(%rbp),%rax
  lea    D20(%rip),%rdx
  mov    %rdx,%rcx
  lea    D65(%rip),%rdx
  mov    %rax,%rsi
  mov    $0x0,%edi
  call   <assert_equal_str@plt>
  lea    -0x20(%rbp),%rax
  mov    $0x3,%edx
  mov    $0xffffffff,%esi
  mov    %rax,%rdi
  call   <pl_slice@plt>
  mov    %rax,-0x28(%rbp)
  mov    -0x28(%rbp),%rax
  lea    D63(%rip),%rdx
  mov    %rdx,%rcx
  lea    D65(%rip),%rdx
  mov    %rax,%rsi
  mov    $0x0,%edi
  call   <assert_equal_str@plt>
  lea    -0x20(%rbp),%rax
  mov    $0x1,%edx
  mov    $0xfffffffc,%esi
  mov    %rax,%rdi
  call   <pl_slice@plt>
  mov    %rax,-0x28(%rbp)
  mov    -0x28(%rbp),%rax
  lea    D12(%rip),%rdx
  mov    %rdx,%rcx
  lea    D65(%rip),%rdx
  mov    %rax,%rsi
  mov    $0x0,%edi
  call   <assert_equal_str@plt>
  nop
  mov    -0x8(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L7
  call   <__stack_chk_fail@plt>
L7:
  leave
  ret
```

tool_calls: name: unpack_data
arguments: label: D97
type: string
name: unpack_data
arguments: label: D65
type: string
name: unpack_data
arguments: label: D42
type: string
name: unpack_data
arguments: label: D20
type: string
name: unpack_data
arguments: label: D63
type: string
name: unpack_data
arguments: label: D12
type: string

tool: D97: Test 1: The ret_val is not empty.

tool: D65: test_slice_negative_offset

tool: D42: Test 2: The ret_val is not empty.

tool: D20: Test 3: The ret_val is not empty.

tool: D63: Test 4: The ret_val is not empty.

tool: D12: Test 5: The ret_val is not empty.

assistant: ```c
void test_slice_negative_offset() {
  char the_string[] = "spam, eggs, and ham";
  char *ret_val;
  ret_val = pl_slice(the_string, -3, 9);
  assert_equal_str(NULL, ret_val, "test_slice_negative_offset", "Test 1: The ret_val is not empty.");
  ret_val = pl_slice(the_string, -1, 9);
  assert_equal_str(NULL, ret_val, "test_slice_negative_offset", "Test 2: The ret_val is not empty.");
  ret_val = pl_slice(the_string, -9, 9);
  assert_equal_str(NULL, ret_val, "test_slice_negative_offset", "Test 3: The ret_val is not empty.");
  ret_val = pl_slice(the_string, -1, 3);
  assert_equal_str(NULL, ret_val, "test_slice_negative_offset", "Test 4: The ret_val is not empty.");
  ret_val = pl_slice(the_string, -4, 1);
  assert_equal_str(NULL, ret_val, "test_slice_negative_offset", "Test 5: The ret_val is not empty.");
}
```