user: 这段汇编代码用C语言表示是什么样的：

```asm
<reduceSpace>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %rdi,%rbx
  sub    $0x18,%rsp
  call   <strlen@plt>
  test   %eax,%eax
  jle    L124
  mov    %eax,%r13d
  movslq %eax,%r14
  lea    -0x1(%rax),%eax
  xor    %ecx,%ecx
  mov    %eax,0xc(%rsp)
  mov    $0x20,%esi
  xor    %edx,%edx
  xor    %r12d,%r12d
  xor    %r9d,%r9d
  jmp    L296
L299:
  mov    %ecx,%r12d
L118:
  add    $0x1,%edx
  cmp    %ecx,0xc(%rsp)
  jne    L57
  cmp    $0x20,%sil
  jne    L265
L57:
  add    $0x1,%rcx
  cmp    %rcx,%r14
  je     L259
L296:
  mov    %esi,%eax
  movzbl (%rbx,%rcx,1),%esi
  cmp    $0x20,%al
  jne    L47
  cmp    %al,%sil
  jne    L299
L47:
  cmp    $0x20,%sil
  jne    L118
  cmp    $0x20,%al
  je     L57
  test   %edx,%edx
  je     L316
L265:
  movslq %r9d,%r11
  movslq %r12d,%rbp
  lea    -0x1(%r11),%rax
  sub    %rbp,%rax
  cmp    $0xe,%rax
  jbe    L204
  cmp    $0x7,%edx
  jle    L204
  test   %edx,%edx
  mov    $0x1,%r10d
  cmovg  %edx,%r10d
  cmp    $0xf,%edx
  jle    L33
  mov    %r10d,%edi
  lea    (%rbx,%rbp,1),%r15
  xor    %eax,%eax
  shr    $0x4,%edi
  lea    (%rbx,%r11,1),%r8
  shl    $0x4,%rdi
  nopl   0x0(%rax)
L285:
  movdqu (%r15,%rax,1),%xmm0
  movups %xmm0,(%r8,%rax,1)
  add    $0x10,%rax
  cmp    %rdi,%rax
  jne    L285
  mov    %r10d,%edi
  and    $0xfffffff0,%edi
  mov    %edi,%eax
  lea    (%r9,%rdi,1),%r8d
  cmp    %edi,%r10d
  je     L53
L138:
  sub    %edi,%r10d
  lea    -0x1(%r10),%r15d
  cmp    $0x6,%r15d
  jbe    L60
  add    %rbx,%rbp
  add    %rbx,%r11
  mov    0x0(%rbp,%rdi,1),%rbp
  mov    %rbp,(%r11,%rdi,1)
  mov    %r10d,%edi
  and    $0xfffffff8,%edi
  add    %edi,%r8d
  add    %edi,%eax
  cmp    %edi,%r10d
  je     L53
L60:
  lea    (%r12,%rax,1),%edi
  lea    0x1(%r8),%r10d
  movslq %edi,%rdi
  movzbl (%rbx,%rdi,1),%r11d
  movslq %r8d,%rdi
  mov    %r11b,(%rbx,%rdi,1)
  lea    0x1(%rax),%edi
  cmp    %edx,%edi
  jge    L53
  add    %r12d,%edi
  movslq %r10d,%r10
  lea    0x2(%r8),%r11d
  movslq %edi,%rdi
  movzbl (%rbx,%rdi,1),%edi
  mov    %dil,(%rbx,%r10,1)
  lea    0x2(%rax),%edi
  cmp    %edx,%edi
  jge    L53
  add    %r12d,%edi
  movslq %r11d,%r11
  lea    0x3(%r8),%r10d
  movslq %edi,%rdi
  movzbl (%rbx,%rdi,1),%edi
  mov    %dil,(%rbx,%r11,1)
  lea    0x3(%rax),%edi
  cmp    %edi,%edx
  jle    L53
  add    %r12d,%edi
  movslq %r10d,%r10
  lea    0x4(%r8),%r11d
  movslq %edi,%rdi
  movzbl (%rbx,%rdi,1),%edi
  mov    %dil,(%rbx,%r10,1)
  lea    0x4(%rax),%edi
  cmp    %edi,%edx
  jle    L53
  add    %r12d,%edi
  movslq %r11d,%r11
  lea    0x5(%r8),%r10d
  movslq %edi,%rdi
  movzbl (%rbx,%rdi,1),%edi
  mov    %dil,(%rbx,%r11,1)
  lea    0x5(%rax),%edi
  cmp    %edi,%edx
  jle    L53
  add    %r12d,%edi
  movslq %r10d,%r10
  add    $0x6,%eax
  add    $0x6,%r8d
  movslq %edi,%rdi
  movzbl (%rbx,%rdi,1),%edi
  mov    %dil,(%rbx,%r10,1)
  cmp    %eax,%edx
  jle    L53
  add    %r12d,%eax
  movslq %r8d,%r8
  cltq
  movzbl (%rbx,%rax,1),%eax
  mov    %al,(%rbx,%r8,1)
L53:
  lea    -0x1(%rdx),%eax
  test   %edx,%edx
  mov    $0x0,%edx
  cmovle %edx,%eax
  lea    0x1(%r9,%rax,1),%r9d
L316:
  xor    %edx,%edx
  cmp    %r9d,%r13d
  jle    L57
  movslq %r9d,%rax
  add    $0x1,%rcx
  add    $0x1,%r9d
  movb   $0x20,(%rbx,%rax,1)
  cmp    %rcx,%r14
  jne    L296
L259:
  cmp    $0x1,%r9d
  jle    L18
  movslq %r9d,%r9
  lea    -0x1(%rbx,%r9,1),%rax
  cmpb   $0x20,(%rax)
  je     L82
L124:
  add    $0x18,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopw   0x0(%rax,%rax,1)
L204:
  xor    %eax,%eax
  lea    (%rbx,%rbp,1),%r10
  lea    (%rbx,%r11,1),%r8
  nopw   0x0(%rax,%rax,1)
L245:
  movzbl (%r10,%rax,1),%edi
  mov    %dil,(%r8,%rax,1)
  add    $0x1,%rax
  cmp    %eax,%edx
  jg     L245
  jmp    L53
  nopl   0x0(%rax,%rax,1)
L18:
  test   $0x1,%r9b
  jne    L124
  cmp    %r13d,%r9d
  jge    L124
  movb   $0x0,(%rbx)
  add    $0x18,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L82:
  movb   $0x0,(%rax)
  add    $0x18,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L33:
  mov    %r9d,%r8d
  xor    %edi,%edi
  xor    %eax,%eax
  jmp    L138
```

assistant: ```c
void reduceSpace(char *s) {
  int startPos = 0;
  int wordbegin = 0;
  int wordLength = 0;
  int length = strlen(s);
  char switchChar = ' ';
  char beforeChar = ' ';
  for (int i = 0; i < length; i++) {
    char currentChar = s[i];
    if (beforeChar == switchChar && beforeChar != currentChar) {
      wordbegin = i;
    }
    if (currentChar != switchChar) {
      wordLength++;
    }
    if ((beforeChar != switchChar && currentChar == switchChar) || (i == length - 1 && currentChar != switchChar)) {
      for (int i = 0; i < wordLength; i++) {
        s[startPos++] = s[wordbegin + i];
      }
      if (startPos < length) {
        s[startPos++] = switchChar;
      }
      wordLength = 0;
    }
    beforeChar = currentChar;
  }
  if (startPos > 1 && s[startPos - 1] == switchChar) {
    s[startPos - 1] = '\0';
  }
  if (startPos == 0 && startPos < length) {
    s[startPos] = '\0';
  }
}
```