user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<elimination_step>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  mov    %esi,%r13d
  push   %r12
  mov    %edi,%r12d
  push   %rbp
  mov    %rdx,%rbp
  push   %rbx
  sub    $0x38,%rsp
  call   <new_matrix@plt>
  mov    %r13d,%esi
  mov    %r12d,%edi
  mov    %rax,(%rsp)
  call   <new_matrix@plt>
  mov    %rax,0x8(%rsp)
  test   %r12d,%r12d
  je     L132
  mov    0x8(%rsp),%rcx
  mov    %r12d,%eax
  mov    %r13d,%esi
  mov    %rax,0x18(%rsp)
  lea    (%rcx,%rax,8),%rdi
  mov    %rcx,0x20(%rsp)
  mov    %rdi,0x28(%rsp)
  nopl   0x0(%rax,%rax,1)
L66:
  xor    %eax,%eax
  test   %r13d,%r13d
  je     L10
  nopw   0x0(%rax,%rax,1)
L148:
  mov    (%rcx),%rdx
  movb   $0x0,(%rdx,%rax,1)
  add    $0x1,%rax
  cmp    %rsi,%rax
  jne    L148
L10:
  add    $0x8,%rcx
  cmp    %rdi,%rcx
  jne    L66
  mov    %r13d,%eax
  xor    %r15d,%r15d
  mov    %rax,0x10(%rsp)
  mov    %rbp,%rax
  mov    %r13d,%ebp
  mov    %r15,%r13
  mov    %rax,%r15
L60:
  mov    %r13d,%r14d
  xor    %ebx,%ebx
  test   %ebp,%ebp
  je     L81
  mov    %r15,%rax
  mov    %r13,%r15
  mov    %r12d,%r13d
  mov    %r14d,%r12d
  mov    %rax,%r14
  jmp    L145
  nopw   0x0(%rax,%rax,1)
L71:
  sub    $0x8,%rsp
  mov    %r13d,%ecx
  mov    %r12d,%esi
  mov    %r14,%r9
  push   0x8(%rsp)
  mov    %ebp,%r8d
  add    $0x1,%rbx
  call   <tag_cell@plt>
  pop    %rcx
  pop    %rsi
  cmp    0x10(%rsp),%rbx
  je     L151
L145:
  mov    (%r14,%r15,8),%rax
  mov    %ebx,%edx
  movzbl (%rax,%rbx,1),%edi
  test   %edi,%edi
  jne    L71
L151:
  mov    %r13d,%r12d
  mov    %r15,%r13
  mov    %r14,%r15
L81:
  add    $0x1,%r13
  cmp    0x18(%rsp),%r13
  jne    L60
  mov    %ebp,%eax
  mov    %r15,%rbp
  xor    %r15d,%r15d
  mov    %rax,%r13
  mov    %rax,0x10(%rsp)
  mov    %rbp,%rax
  mov    %r13d,%ebp
  mov    %r12d,%r13d
  mov    %rax,%r12
  nopl   0x0(%rax)
L27:
  mov    %r15d,%r14d
  xor    %ebx,%ebx
  test   %ebp,%ebp
  je     L160
  mov    %r12,%rax
  mov    %r14d,%r12d
  mov    %r15,%r14
  mov    %r13d,%r15d
  mov    %rax,%r13
  jmp    L96
  nopw   0x0(%rax,%rax,1)
L86:
  push   0x8(%rsp)
  mov    %r13,%r9
  mov    %ebp,%r8d
  mov    %r15d,%ecx
  push   0x8(%rsp)
  mov    %r12d,%esi
  add    $0x1,%rbx
  call   <mark_delete@plt>
  pop    %rax
  pop    %rdx
  cmp    0x10(%rsp),%rbx
  je     L35
L96:
  mov    0x0(%r13,%r14,8),%rax
  mov    %ebx,%edx
  movzbl (%rax,%rbx,1),%edi
  test   %edi,%edi
  jne    L86
L35:
  mov    %r13,%r12
  mov    %r15d,%r13d
  mov    %r14,%r15
L160:
  add    $0x1,%r15
  cmp    0x18(%rsp),%r15
  jne    L27
  mov    %r12,%rax
  mov    %ebp,%ecx
  mov    0x20(%rsp),%rsi
  mov    0x28(%rsp),%rdi
  mov    %r13d,%r12d
  mov    %rax,%rbp
  mov    %rcx,%r13
  nopl   0x0(%rax)
L79:
  xor    %eax,%eax
  test   %r13d,%r13d
  je     L143
  nopw   0x0(%rax,%rax,1)
L84:
  mov    (%rsi),%rdx
  cmpb   $0x0,(%rdx,%rax,1)
  je     L36
  mov    0x0(%rbp),%rdx
  movb   $0x0,(%rdx,%rax,1)
L36:
  add    $0x1,%rax
  cmp    %rcx,%rax
  jne    L84
L143:
  add    $0x8,%rsi
  add    $0x8,%rbp
  cmp    %rdi,%rsi
  jne    L79
L132:
  mov    (%rsp),%rsi
  mov    %r12d,%edi
  call   <free_matrix@plt>
  mov    0x8(%rsp),%rax
  add    $0x38,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
unsigned char **elimination_step(const unsigned int width, const unsigned int height, unsigned char **const grid) {
  unsigned int i, j;
  unsigned int cell;
  unsigned char **const tag = new_matrix(width, height);
  unsigned char **const record = new_matrix(width, height);
  for (i = 0; i < width; i++) {
    for (j = 0; j < height; j++) {
      record[i][j] = 0;
    }
  }
  for (i = 0; i < width; i++) {
    for (j = 0; j < height; j++) {
      cell = grid[i][j];
      if (cell) {
        tag_cell(cell, i, j, width, height, grid, tag);
      } else {
        break;
      }
    }
  }
  for (i = 0; i < width; i++) {
    for (j = 0; j < height; j++) {
      cell = grid[i][j];
      if (cell) {
        mark_delete(cell, i, j, width, height, grid, tag, record);
      } else {
        break;
      }
    }
  }
  for (i = 0; i < width; i++) {
    for (j = 0; j < height; j++) {
      if (record[i][j]) {
        grid[i][j] = 0;
      }
    }
  }
  free_matrix(width, tag);
  return record;
}
```