user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<get_common_chars>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbx
  sub    $0xa8,%rsp
  mov    %rdi,-0x88(%rbp)
  mov    %rsi,-0x90(%rbp)
  mov    %edx,-0x94(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  mov    %rsp,%rax
  mov    %rax,%r13
  mov    -0x88(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  lea    0x1(%rax),%ebx
  movslq %ebx,%rax
  sub    $0x1,%rax
  mov    %rax,-0x60(%rbp)
  movslq %ebx,%rax
  mov    %rax,-0xb0(%rbp)
  movq   $0x0,-0xa8(%rbp)
  movslq %ebx,%rax
  mov    %rax,-0xc0(%rbp)
  movq   $0x0,-0xb8(%rbp)
  movslq %ebx,%rax
  mov    $0x10,%edx
  sub    $0x1,%rdx
  add    %rdx,%rax
  mov    $0x10,%esi
  mov    $0x0,%edx
  div    %rsi
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L119:
  cmp    %rdx,%rsp
  je     L22
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L119
L22:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L17
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L17:
  mov    %rsp,%rax
  add    $0x0,%rax
  mov    %rax,-0x58(%rbp)
  mov    -0x90(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  add    $0x1,%eax
  movslq %eax,%rdx
  sub    $0x1,%rdx
  mov    %rdx,-0x50(%rbp)
  movslq %eax,%rdx
  mov    %rdx,-0xd0(%rbp)
  movq   $0x0,-0xc8(%rbp)
  movslq %eax,%rdx
  mov    %rdx,%r14
  mov    $0x0,%r15d
  cltq
  mov    $0x10,%edx
  sub    $0x1,%rdx
  add    %rdx,%rax
  mov    $0x10,%esi
  mov    $0x0,%edx
  div    %rsi
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L98:
  cmp    %rdx,%rsp
  je     L145
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L98
L145:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L69
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L69:
  mov    %rsp,%rax
  add    $0x0,%rax
  mov    %rax,-0x48(%rbp)
  movl   $0x0,-0x6c(%rbp)
  mov    -0x90(%rbp),%rdx
  mov    -0x48(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcpy@plt>
  movl   $0x0,-0x74(%rbp)
  jmp    L72
L92:
  mov    -0x74(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x88(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  mov    %al,-0x75(%rbp)
  mov    -0x74(%rbp),%eax
  sub    -0x94(%rbp),%eax
  mov    $0x0,%edx
  test   %eax,%eax
  cmovs  %edx,%eax
  mov    %eax,-0x68(%rbp)
  mov    -0x74(%rbp),%edx
  mov    -0x94(%rbp),%eax
  lea    (%rdx,%rax,1),%r12d
  mov    -0x90(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  sub    $0x1,%eax
  cmp    %eax,%r12d
  jge    L114
  mov    -0x74(%rbp),%edx
  mov    -0x94(%rbp),%eax
  add    %edx,%eax
  jmp    L123
L114:
  mov    -0x90(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  sub    $0x1,%eax
L123:
  mov    %eax,-0x64(%rbp)
  mov    -0x68(%rbp),%eax
  mov    %eax,-0x70(%rbp)
  jmp    L24
L148:
  mov    -0x48(%rbp),%rdx
  mov    -0x70(%rbp),%eax
  cltq
  movzbl (%rdx,%rax,1),%eax
  cmp    %al,-0x75(%rbp)
  jne    L48
  mov    -0x58(%rbp),%rdx
  mov    -0x6c(%rbp),%eax
  cltq
  movzbl -0x75(%rbp),%ecx
  mov    %cl,(%rdx,%rax,1)
  mov    -0x48(%rbp),%rdx
  mov    -0x70(%rbp),%eax
  cltq
  movb   $0x0,(%rdx,%rax,1)
  addl   $0x1,-0x6c(%rbp)
  jmp    L103
L48:
  addl   $0x1,-0x70(%rbp)
L24:
  mov    -0x70(%rbp),%eax
  cmp    -0x64(%rbp),%eax
  jl     L148
L103:
  addl   $0x1,-0x74(%rbp)
L72:
  mov    -0x88(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  cmp    %eax,-0x74(%rbp)
  jl     L92
  mov    -0x6c(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %edx,-0x6c(%rbp)
  mov    -0x58(%rbp),%rdx
  cltq
  movb   $0x0,(%rdx,%rax,1)
  mov    -0x58(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  imul   %ebx,%eax
  add    $0x1,%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x40(%rbp)
  mov    -0x58(%rbp),%rdx
  mov    -0x40(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcpy@plt>
  mov    -0x40(%rbp),%rax
  mov    %r13,%rsp
  mov    -0x38(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L105
  call   <__stack_chk_fail@plt>
L105:
  lea    -0x28(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
```

assistant: ```c
char *get_common_chars(const char *str1, const char *str2, const int d_step) {
  char *ret_str;
  char ret[strlen(str1) + 1];
  char copy[strlen(str2) + 1];
  int i, j, k = 0;
  strcpy(copy, str2);
  for (i = 0; i < (int)strlen(str1); i++) {
    char tmp = str1[i];
    int max = (((0 > (i - d_step))) ? (0) : ((i - d_step)));
    int min = (((i + d_step < ((int)strlen(str2) - 1))) ? (i + d_step) : (((int)strlen(str2) - 1)));
    for (j = max; j < min; j++) {
      if (copy[j] == tmp) {
        ret[k] = tmp;
        copy[j] = (char)0;
        k++;
        break;
      }
    }
  }
  ret[k++] = '\0';
  ret_str = malloc((sizeof(ret) * strlen(ret)) + 1);
  strcpy(ret_str, ret);
  return (ret_str);
}
```