user: 请将这段汇编代码片段转换成等效的C代码:

```asm
<trim>:
  endbr64
  push   %r13
  push   %r12
  push   %rbp
  xor    %ebp,%ebp
  push   %rbx
  mov    %rdi,%rbx
  sub    $0x8,%rsp
  call   <strlen@plt>
  lea    -0x1(%rax),%r12d
  nopl   0x0(%rax)
L21:
  mov    %rbx,%rdi
  mov    %ebp,%r13d
  call   <strlen@plt>
  cmp    %ebp,%eax
  jle    L154
  movzbl (%rbx,%rbp,1),%eax
  add    $0x1,%rbp
  cmp    $0x20,%al
  je     L21
  cmp    $0x9,%al
  je     L21
L104:
  mov    %rbx,%rdi
  call   <strlen@plt>
  sub    $0x1,%eax
  cmp    %eax,%r13d
  jge    L17
  movabs $0xfffffffeffffd9ff,%rsi
  cltq
  nopl   0x0(%rax,%rax,1)
L106:
  movzbl (%rbx,%rax,1),%edx
  mov    %eax,%ecx
  cmp    $0x20,%dl
  jbe    L153
L193:
  cmp    %ecx,%r13d
  jg     L149
  mov    %ecx,%edi
  movslq %r13d,%rdx
  sub    %r13d,%edi
  cmp    $0x6,%edi
  jbe    L22
  lea    0x1(%rdi),%r8d
  cmp    $0xe,%edi
  jbe    L113
  mov    %r8d,%esi
  add    %rbx,%rdx
  xor    %eax,%eax
  shr    $0x4,%esi
  shl    $0x4,%rsi
  nopl   (%rax)
L33:
  movdqu (%rdx,%rax,1),%xmm0
  movups %xmm0,(%rbx,%rax,1)
  add    $0x10,%rax
  cmp    %rax,%rsi
  jne    L33
  mov    %r8d,%esi
  and    $0xfffffff0,%esi
  lea    (%rsi,%r13,1),%eax
  cmp    %esi,%r8d
  je     L7
  sub    %esi,%edi
  lea    0x1(%rdi),%r8d
  cmp    $0x6,%edi
  jbe    L215
L43:
  mov    (%rdx,%rsi,1),%rdx
  mov    %rdx,(%rbx,%rsi,1)
  mov    %r8d,%edx
  and    $0xfffffff8,%edx
  add    %edx,%eax
  cmp    %edx,%r8d
  je     L7
L215:
  movslq %eax,%rdx
  movzbl (%rbx,%rdx,1),%esi
  mov    %eax,%edx
  sub    %r13d,%edx
  movslq %edx,%rdx
  mov    %sil,(%rbx,%rdx,1)
  lea    0x1(%rax),%edx
  cmp    %edx,%ecx
  jl     L7
  movslq %edx,%rsi
  sub    %r13d,%edx
  movzbl (%rbx,%rsi,1),%esi
  movslq %edx,%rdx
  mov    %sil,(%rbx,%rdx,1)
  lea    0x2(%rax),%edx
  cmp    %ecx,%edx
  jg     L7
  movslq %edx,%rsi
  sub    %r13d,%edx
  movzbl (%rbx,%rsi,1),%esi
  movslq %edx,%rdx
  mov    %sil,(%rbx,%rdx,1)
  lea    0x3(%rax),%edx
  cmp    %edx,%ecx
  jl     L7
  movslq %edx,%rsi
  sub    %r13d,%edx
  movzbl (%rbx,%rsi,1),%esi
  movslq %edx,%rdx
  mov    %sil,(%rbx,%rdx,1)
  lea    0x4(%rax),%edx
  cmp    %edx,%ecx
  jl     L7
  movslq %edx,%rsi
  sub    %r13d,%edx
  movzbl (%rbx,%rsi,1),%esi
  movslq %edx,%rdx
  mov    %sil,(%rbx,%rdx,1)
  lea    0x5(%rax),%edx
  cmp    %edx,%ecx
  jl     L7
  movslq %edx,%rsi
  sub    %r13d,%edx
  add    $0x6,%eax
  movzbl (%rbx,%rsi,1),%esi
  movslq %edx,%rdx
  mov    %sil,(%rbx,%rdx,1)
  cmp    %eax,%ecx
  jl     L7
  movslq %eax,%rdx
  sub    %r13d,%eax
  movzbl (%rbx,%rdx,1),%edx
  cltq
  mov    %dl,(%rbx,%rax,1)
L7:
  add    $0x1,%ecx
  sub    %r13d,%ecx
  movslq %ecx,%rcx
  add    %rcx,%rbx
L149:
  movb   $0x0,(%rbx)
  add    $0x8,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
  nopl   0x0(%rax,%rax,1)
L153:
  bt     %rdx,%rsi
  jb     L193
  sub    $0x1,%rax
  cmp    %eax,%r13d
  jl     L106
L17:
  mov    %r12d,%ecx
  jmp    L193
  nop
L154:
  xor    %r13d,%r13d
  jmp    L104
  nopl   0x0(%rax,%rax,1)
L22:
  mov    %rbx,%rax
  lea    0x1(%rbx,%rdi,1),%rdi
  nopl   0x0(%rax,%rax,1)
L97:
  movzbl (%rax,%rdx,1),%esi
  add    $0x1,%rax
  mov    %sil,-0x1(%rax)
  cmp    %rdi,%rax
  jne    L97
  jmp    L7
L113:
  mov    %r13d,%eax
  xor    %esi,%esi
  add    %rbx,%rdx
  jmp    L43
```

assistant: ```c
void trim(char *str) {
  int i, start = 0, end = strlen(str) - 1;
  for (i = 0; i < strlen(str); i++) {
    if ((str[i] != ' ') && (str[i] != '\t')) {
      start = i;
      break;
    }
  }
  for (i = strlen(str) - 1; i > start; i--) {
    if ((str[i] != ' ') && (str[i] != '\t') && (str[i] != 10) && (str[i] != 13)) {
      end = i;
      break;
    }
  }
  for (i = start; i <= end; i++) {
    str[i - start] = str[i];
  }
  str[i - start] = 0;
}
```