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

```asm
<test_1>:
  endbr64
  push   %r15
  lea    D18(%rip),%rsi
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %edi,%ebx
  lea    D24(%rip),%rdi
  lea    0x0(,%rbx,8),%r14d
  sub    $0x18,%rsp
  call   <fopen@plt>
  mov    %r14d,%edi
  mov    %rax,%r15
  call   <malloc@plt>
  lea    -0x1(%rbx),%r8d
  lea    0x0(,%r8,8),%ebp
  mov    %r8d,0xc(%rsp)
  mov    %rax,%r13
  mov    %ebp,%edi
  call   <malloc@plt>
  mov    %ebp,%edi
  mov    %rax,%r12
  call   <malloc@plt>
  mov    %r14d,%edi
  mov    %rax,(%rsp)
  call   <malloc@plt>
  mov    %r14d,%edi
  mov    %rax,%rbp
  call   <malloc@plt>
  mov    %r15,%rcx
  mov    %ebx,%edx
  mov    $0x8,%esi
  mov    %r13,%rdi
  mov    %rax,%r14
  call   <fread@plt>
  mov    0xc(%rsp),%edx
  mov    %r15,%rcx
  mov    %r12,%rdi
  mov    $0x8,%esi
  call   <fread@plt>
  mov    0xc(%rsp),%edx
  mov    (%rsp),%rdi
  mov    %r15,%rcx
  mov    $0x8,%esi
  call   <fread@plt>
  mov    %r15,%rcx
  mov    %ebx,%edx
  mov    $0x8,%esi
  mov    %rbp,%rdi
  call   <fread@plt>
  mov    %r15,%rcx
  mov    %ebx,%edx
  mov    $0x8,%esi
  mov    %r14,%rdi
  call   <fread@plt>
  mov    (%rsp),%rdi
  mov    %ebx,%r8d
  mov    %rbp,%rcx
  mov    %r12,%rdx
  mov    %r13,%rsi
  call   <thomas_alg@plt>
  test   %ebx,%ebx
  jle    L2
  mov    %ebx,%eax
  mov    %r14,%rdx
  pxor   %xmm0,%xmm0
  lea    0x0(%rbp,%rax,8),%rcx
  sub    %rbp,%rdx
  mov    %rbp,%rax
  nopl   0x0(%rax)
L12:
  movsd  (%rax),%xmm1
  subsd  (%rdx,%rax,1),%xmm1
  add    $0x8,%rax
  mulsd  %xmm1,%xmm1
  addsd  %xmm1,%xmm0
  cmp    %rcx,%rax
  jne    L12
L3:
  pxor   %xmm1,%xmm1
  cvtsi2sd %ebx,%xmm1
  divsd  %xmm1,%xmm0
  movsd  D35(%rip),%xmm1
  call   <pow@plt>
  lea    D34(%rip),%rdi
  call   <printf@plt>
  mov    %r13,%rdi
  call   <free@plt>
  mov    %r12,%rdi
  call   <free@plt>
  mov    (%rsp),%rdi
  call   <free@plt>
  mov    %rbp,%rdi
  call   <free@plt>
  add    $0x18,%rsp
  mov    %r14,%rdi
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    10b0 <free@plt>
  cs nopw 0x0(%rax,%rax,1)
L2:
  pxor   %xmm0,%xmm0
  jmp    L3
```

tool_calls: name: disassemble_data
arguments: data_label: D18
type_guessed: string
name: disassemble_data
arguments: data_label: D24
type_guessed: string
name: disassemble_data
arguments: data_label: D35
type_guessed: f32[2]
name: disassemble_data
arguments: data_label: D34
type_guessed: string

tool: D18: r

tool: D24: input.dat

tool: {"D35": [0.0,1.75]}

tool: D34: Error is %.5e


assistant: ```c
void test_1(int n) {
  FILE *f = fopen("input.dat", "r");
  double *md = (double *)malloc(sizeof(double) * n);
  double *ud = (double *)malloc(sizeof(double) * (n - 1));
  double *ld = (double *)malloc(sizeof(double) * (n - 1));
  double *fd = (double *)malloc(sizeof(double) * n);
  double *ans = (double *)malloc(sizeof(double) * n);
  fread(md, sizeof(double), n, f);
  fread(ud, sizeof(double), (n - 1), f);
  fread(ld, sizeof(double), (n - 1), f);
  fread(fd, sizeof(double), n, f);
  fread(ans, sizeof(double), n, f);
  thomas_alg(ld, md, ud, fd, n);
  int i;
  double err = 0;
  for (i = 0; i < n; i++)
    err += (fd[i] - ans[i]) * (fd[i] - ans[i]);
  err = pow(err / n, .5);
  printf("Error is %.5e\n", err);
  free(md);
  free(ud);
  free(ld);
  free(fd);
  free(ans);
  return;
}
```