user: 这段汇编代码用C语言表示是什么样的:

```asm
<build>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x58,%rsp
  mov    %edi,0x48(%rsp)
  test   %edi,%edi
  jle    L36
  mov    %rsi,%rbx
  movsbl (%rsi),%esi
  mov    %rdx,%rdi
  mov    %rdx,%r13
  mov    %rcx,%rbp
  call   <strchr@plt>
  sub    %r13,%rax
  mov    %rax,%r14
  movslq %eax,%r12
  test   %eax,%eax
  jle    L163
  movsbl 0x1(%rbx),%esi
  mov    %r13,%rdi
  call   <strchr@plt>
  sub    %r13,%rax
  mov    %rax,%r8
  cltq
  test   %r8d,%r8d
  jle    L13
  movsbl 0x2(%rbx),%esi
  mov    %r13,%rdi
  mov    %r8,(%rsp)
  call   <strchr@plt>
  mov    (%rsp),%r8
  sub    %r13,%rax
  mov    %rax,%r12
  cltq
  test   %r12d,%r12d
  jle    L51
  movsbl 0x3(%rbx),%esi
  mov    %r13,%rdi
  mov    %r8,(%rsp)
  call   <strchr@plt>
  lea    0x4(%rbx),%rsi
  mov    %rbp,%rcx
  mov    %r13,%rdx
  sub    %r13,%rax
  mov    %rax,%r15
  mov    %eax,%edi
  call   <build>
  movslq %r15d,%rcx
  mov    %r12d,%edi
  lea    0x1(%rcx),%rax
  sub    %r15d,%edi
  add    %rbp,%rcx
  lea    0x0(%r13,%rax,1),%rdx
  lea    0x3(%rbx,%rax,1),%rsi
  sub    $0x1,%edi
  call   <build>
  movzbl 0x3(%rbx),%edx
  movslq %r12d,%rax
  mov    (%rsp),%r8
  mov    %dl,-0x1(%rbp,%rax,1)
L51:
  mov    %r8d,%r15d
  sub    %r12d,%r15d
  sub    $0x1,%r15d
  test   %r15d,%r15d
  jle    L133
  lea    0x0(%rbp,%rax,1),%rcx
  add    $0x1,%rax
  mov    %r8,0x18(%rsp)
  lea    0x2(%rbx,%rax,1),%r12
  lea    0x0(%r13,%rax,1),%rdx
  mov    %rcx,(%rsp)
  movsbl (%r12),%esi
  mov    %rdx,%rdi
  mov    %rdx,0x8(%rsp)
  call   <strchr@plt>
  mov    0x8(%rsp),%rdx
  mov    (%rsp),%rcx
  lea    0x1(%r12),%rsi
  sub    %rdx,%rax
  mov    %eax,%edi
  mov    %rax,0x10(%rsp)
  call   <build>
  mov    0x10(%rsp),%rax
  mov    0x8(%rsp),%rdx
  mov    %r15d,%edi
  movslq %r15d,%r15
  movslq %eax,%rcx
  sub    %eax,%edi
  lea    0x1(%rcx),%rsi
  sub    $0x1,%edi
  add    (%rsp),%rcx
  add    %rsi,%rdx
  add    %r12,%rsi
  call   <build>
  movzbl (%r12),%eax
  mov    (%rsp),%rcx
  mov    0x18(%rsp),%r8
  mov    %al,-0x1(%rcx,%r15,1)
L133:
  movzbl 0x2(%rbx),%edx
  movslq %r8d,%rax
  mov    %dl,-0x1(%rbp,%rax,1)
L13:
  mov    %r14d,%r10d
  sub    %r8d,%r10d
  sub    $0x1,%r10d
  test   %r10d,%r10d
  mov    %r10d,0x10(%rsp)
  jle    L23
  lea    0x0(%rbp,%rax,1),%rcx
  lea    0x1(%r13,%rax,1),%r12
  lea    0x2(%rbx,%rax,1),%rax
  mov    %r12,%rdi
  mov    %rcx,0x8(%rsp)
  movsbl (%rax),%esi
  mov    %rax,(%rsp)
  call   <strchr@plt>
  movslq 0x10(%rsp),%r10
  sub    %r12,%rax
  mov    %rax,%r15
  cltq
  test   %r15d,%r15d
  jle    L105
  mov    (%rsp),%rax
  mov    %r12,%rdi
  mov    %r10d,0x18(%rsp)
  movsbl 0x1(%rax),%esi
  call   <strchr@plt>
  mov    0x8(%rsp),%rcx
  mov    %r12,%rdx
  sub    %r12,%rax
  mov    %eax,%edi
  mov    %rax,0x10(%rsp)
  mov    (%rsp),%rax
  lea    0x2(%rax),%rsi
  call   <build>
  mov    0x10(%rsp),%rax
  mov    (%rsp),%rdi
  mov    %r15d,%r11d
  mov    0x8(%rsp),%rcx
  movslq %eax,%rsi
  sub    %eax,%r11d
  add    %rsi,%rcx
  lea    0x1(%r12,%rsi,1),%rdx
  lea    0x2(%rdi,%rsi,1),%rsi
  mov    %r11d,%edi
  sub    $0x1,%edi
  call   <build>
  mov    (%rsp),%rdi
  mov    0x8(%rsp),%rcx
  movslq %r15d,%rax
  movslq 0x18(%rsp),%r10
  movzbl 0x1(%rdi),%edx
  mov    %dl,-0x1(%rcx,%rax,1)
L105:
  mov    %r10d,%r11d
  sub    %r15d,%r11d
  sub    $0x1,%r11d
  test   %r11d,%r11d
  mov    %r11d,0x10(%rsp)
  jle    L91
  mov    0x8(%rsp),%rcx
  mov    %r10d,0x28(%rsp)
  lea    (%rcx,%rax,1),%r15
  mov    (%rsp),%rcx
  add    $0x1,%rax
  lea    (%r12,%rax,1),%rdx
  lea    (%rcx,%rax,1),%r12
  mov    %rdx,%rdi
  mov    %rdx,0x18(%rsp)
  movsbl (%r12),%esi
  call   <strchr@plt>
  mov    0x18(%rsp),%rdx
  lea    0x1(%r12),%rsi
  mov    %r15,%rcx
  sub    %rdx,%rax
  mov    %eax,%edi
  mov    %rax,0x20(%rsp)
  call   <build>
  mov    0x20(%rsp),%rax
  mov    0x10(%rsp),%edi
  mov    0x18(%rsp),%rdx
  movslq %eax,%rcx
  sub    %eax,%edi
  lea    0x1(%rcx),%rsi
  sub    $0x1,%edi
  add    %r15,%rcx
  add    %rsi,%rdx
  add    %r12,%rsi
  call   <build>
  movzbl (%r12),%eax
  movslq 0x10(%rsp),%r11
  movslq 0x28(%rsp),%r10
  mov    %al,-0x1(%r15,%r11,1)
L91:
  mov    (%rsp),%rax
  mov    0x8(%rsp),%rcx
  movzbl (%rax),%eax
  mov    %al,-0x1(%rcx,%r10,1)
L23:
  movzbl 0x1(%rbx),%eax
  movslq %r14d,%r12
  mov    %al,-0x1(%rbp,%r12,1)
L163:
  mov    0x48(%rsp),%eax
  sub    %r14d,%eax
  lea    -0x1(%rax),%r15d
  test   %r15d,%r15d
  jle    L156
  lea    0x0(%rbp,%r12,1),%rax
  add    $0x1,%r12
  lea    0x0(%r13,%r12,1),%r14
  add    %rbx,%r12
  mov    %rax,(%rsp)
  movsbl (%r12),%esi
  mov    %r14,%rdi
  call   <strchr@plt>
  sub    %r14,%rax
  mov    %rax,%r9
  cltq
  test   %r9d,%r9d
  jle    L125
  movsbl 0x1(%r12),%esi
  mov    %r14,%rdi
  mov    %r9,0x8(%rsp)
  call   <strchr@plt>
  mov    0x8(%rsp),%r9
  sub    %r14,%rax
  mov    %rax,%r13
  cltq
  test   %r13d,%r13d
  jle    L63
  movsbl 0x2(%r12),%esi
  mov    %r14,%rdi
  mov    %r9,0x10(%rsp)
  call   <strchr@plt>
  mov    (%rsp),%rcx
  lea    0x3(%r12),%rsi
  mov    %r14,%rdx
  sub    %r14,%rax
  mov    %eax,%edi
  mov    %rax,0x8(%rsp)
  call   <build>
  mov    0x8(%rsp),%r8
  mov    (%rsp),%rcx
  mov    %r13d,%edi
  movslq %r8d,%rdx
  sub    %r8d,%edi
  lea    0x1(%rdx),%rax
  add    %rdx,%rcx
  sub    $0x1,%edi
  lea    (%r14,%rax,1),%rdx
  lea    0x2(%r12,%rax,1),%rsi
  call   <build>
  movzbl 0x2(%r12),%edx
  mov    (%rsp),%rcx
  movslq %r13d,%rax
  mov    0x10(%rsp),%r9
  mov    %dl,-0x1(%rcx,%rax,1)
L63:
  mov    %r9d,%r10d
  sub    %r13d,%r10d
  sub    $0x1,%r10d
  test   %r10d,%r10d
  mov    %r10d,0x10(%rsp)
  jle    L136
  lea    0x2(%r12,%rax,1),%r13
  mov    (%rsp),%rcx
  lea    0x1(%r14,%rax,1),%rdx
  mov    %r9,0x28(%rsp)
  movsbl 0x0(%r13),%esi
  mov    %rdx,%rdi
  mov    %rdx,0x18(%rsp)
  add    %rax,%rcx
  mov    %rcx,0x8(%rsp)
  call   <strchr@plt>
  mov    0x18(%rsp),%rdx
  mov    0x8(%rsp),%rcx
  lea    0x1(%r13),%rsi
  sub    %rdx,%rax
  mov    %eax,%edi
  mov    %rax,0x20(%rsp)
  call   <build>
  mov    0x20(%rsp),%rax
  mov    0x10(%rsp),%edi
  mov    0x18(%rsp),%rdx
  movslq %eax,%rcx
  sub    %eax,%edi
  lea    0x1(%rcx),%rsi
  sub    $0x1,%edi
  add    0x8(%rsp),%rcx
  add    %rsi,%rdx
  add    %r13,%rsi
  call   <build>
  movzbl 0x0(%r13),%eax
  movslq 0x10(%rsp),%r10
  mov    0x8(%rsp),%rcx
  mov    0x28(%rsp),%r9
  mov    %al,-0x1(%rcx,%r10,1)
L136:
  movzbl 0x1(%r12),%edx
  mov    (%rsp),%rcx
  movslq %r9d,%rax
  mov    %dl,-0x1(%rcx,%rax,1)
L125:
  mov    %r15d,%edx
  sub    %r9d,%edx
  lea    -0x1(%rdx),%ecx
  mov    %ecx,0x10(%rsp)
  test   %ecx,%ecx
  jle    L145
  mov    (%rsp),%rcx
  add    %rax,%rcx
  add    $0x1,%rax
  lea    (%r12,%rax,1),%r13
  add    %rax,%r14
  mov    %rcx,0x8(%rsp)
  movsbl 0x0(%r13),%esi
  mov    %r14,%rdi
  call   <strchr@plt>
  sub    %r14,%rax
  mov    %rax,%r9
  cltq
  test   %r9d,%r9d
  jle    L40
  movsbl 0x1(%r13),%esi
  mov    %r14,%rdi
  mov    %r9,0x18(%rsp)
  call   <strchr@plt>
  mov    0x18(%rsp),%r9
  sub    %r14,%rax
  mov    %rax,%r8
  cltq
  test   %r8d,%r8d
  jle    L128
  movsbl 0x2(%r13),%esi
  mov    %r14,%rdi
  mov    %r9,0x20(%rsp)
  mov    %r8,0x28(%rsp)
  call   <strchr@plt>
  mov    0x8(%rsp),%rcx
  lea    0x3(%r13),%rsi
  mov    %r14,%rdx
  sub    %r14,%rax
  mov    %eax,%edi
  mov    %rax,0x18(%rsp)
  call   <build>
  mov    0x18(%rsp),%rax
  mov    0x28(%rsp),%r8
  movslq %eax,%rcx
  mov    %r8d,%edi
  mov    %r8,0x18(%rsp)
  lea    0x1(%rcx),%rdx
  sub    %eax,%edi
  add    0x8(%rsp),%rcx
  lea    (%r14,%rdx,1),%r10
  lea    0x2(%r13,%rdx,1),%rsi
  sub    $0x1,%edi
  mov    %r10,%rdx
  call   <build>
  mov    0x18(%rsp),%r8
  movzbl 0x2(%r13),%edx
  mov    0x8(%rsp),%rcx
  mov    0x20(%rsp),%r9
  movslq %r8d,%rax
  mov    %dl,-0x1(%rcx,%rax,1)
L128:
  mov    %r9d,%r10d
  sub    %r8d,%r10d
  sub    $0x1,%r10d
  test   %r10d,%r10d
  mov    %r10d,0x28(%rsp)
  jle    L119
  mov    0x8(%rsp),%rcx
  lea    0x1(%r14,%rax,1),%rdx
  mov    %r9,0x40(%rsp)
  mov    %rdx,%rdi
  mov    %rdx,0x30(%rsp)
  add    %rax,%rcx
  lea    0x2(%r13,%rax,1),%rax
  movsbl (%rax),%esi
  mov    %rcx,0x18(%rsp)
  mov    %rax,0x20(%rsp)
  call   <strchr@plt>
  mov    0x30(%rsp),%rdx
  mov    0x18(%rsp),%rcx
  sub    %rdx,%rax
  mov    %eax,%edi
  mov    %rax,0x38(%rsp)
  mov    0x20(%rsp),%rax
  lea    0x1(%rax),%rsi
  call   <build>
  mov    0x38(%rsp),%rax
  mov    0x28(%rsp),%edi
  mov    0x30(%rsp),%rdx
  movslq %eax,%rcx
  sub    %eax,%edi
  lea    0x1(%rcx),%rsi
  sub    $0x1,%edi
  add    0x18(%rsp),%rcx
  add    %rsi,%rdx
  add    0x20(%rsp),%rsi
  call   <build>
  mov    0x20(%rsp),%rax
  movslq 0x28(%rsp),%r10
  mov    0x18(%rsp),%rcx
  mov    0x40(%rsp),%r9
  movzbl (%rax),%eax
  mov    %al,-0x1(%rcx,%r10,1)
L119:
  movzbl 0x1(%r13),%edx
  mov    0x8(%rsp),%rcx
  movslq %r9d,%rax
  mov    %dl,-0x1(%rcx,%rax,1)
L40:
  mov    0x10(%rsp),%edx
  sub    %r9d,%edx
  lea    -0x1(%rdx),%r9d
  test   %r9d,%r9d
  mov    %r9d,0x20(%rsp)
  jle    L4
  mov    0x8(%rsp),%rcx
  lea    (%rcx,%rax,1),%rdx
  add    $0x1,%rax
  lea    (%r14,%rax,1),%r8
  lea    0x0(%r13,%rax,1),%r14
  mov    %rdx,0x18(%rsp)
  movsbl (%r14),%esi
  mov    %r8,%rdi
  mov    %r8,0x28(%rsp)
  call   <strchr@plt>
  mov    0x28(%rsp),%r8
  movslq 0x20(%rsp),%r9
  sub    %r8,%rax
  mov    %rax,%r10
  cltq
  test   %r10d,%r10d
  jle    L150
  movsbl 0x1(%r14),%esi
  mov    %r8,%rdi
  mov    %r9d,0x30(%rsp)
  mov    %r10,0x38(%rsp)
  mov    %r8,0x20(%rsp)
  call   <strchr@plt>
  mov    0x20(%rsp),%r8
  mov    0x18(%rsp),%rcx
  lea    0x2(%r14),%rsi
  sub    %r8,%rax
  mov    %r8,%rdx
  mov    %eax,%edi
  mov    %rax,0x28(%rsp)
  call   <build>
  mov    0x28(%rsp),%rax
  mov    0x38(%rsp),%r10
  mov    0x20(%rsp),%r8
  mov    0x18(%rsp),%rcx
  movslq %eax,%rdx
  mov    %r10d,%edi
  mov    %r10,0x20(%rsp)
  lea    0x1(%r8,%rdx,1),%r11
  sub    %eax,%edi
  add    %rdx,%rcx
  mov    %r8,0x28(%rsp)
  lea    0x2(%r14,%rdx,1),%rsi
  sub    $0x1,%edi
  mov    %r11,%rdx
  call   <build>
  mov    0x20(%rsp),%r10
  movzbl 0x1(%r14),%edx
  mov    0x18(%rsp),%rcx
  movslq 0x30(%rsp),%r9
  movslq %r10d,%rax
  mov    0x28(%rsp),%r8
  mov    %dl,-0x1(%rcx,%rax,1)
L150:
  mov    %r9d,%edx
  sub    %r10d,%edx
  lea    -0x1(%rdx),%r10d
  test   %r10d,%r10d
  mov    %r10d,0x30(%rsp)
  jle    L69
  mov    0x18(%rsp),%rcx
  mov    %r9d,0x4c(%rsp)
  add    %rax,%rcx
  add    $0x1,%rax
  add    %rax,%r8
  add    %r14,%rax
  mov    %rcx,0x20(%rsp)
  movsbl (%rax),%esi
  mov    %r8,%rdi
  mov    %r8,0x38(%rsp)
  mov    %rax,0x28(%rsp)
  call   <strchr@plt>
  mov    0x38(%rsp),%r8
  mov    0x20(%rsp),%rcx
  sub    %r8,%rax
  mov    %r8,%rdx
  mov    %eax,%edi
  mov    %rax,0x40(%rsp)
  mov    0x28(%rsp),%rax
  lea    0x1(%rax),%rsi
  call   <build>
  mov    0x40(%rsp),%rax
  mov    0x30(%rsp),%edi
  mov    0x38(%rsp),%r8
  movslq %eax,%rcx
  sub    %eax,%edi
  lea    0x1(%rcx),%rsi
  sub    $0x1,%edi
  add    0x20(%rsp),%rcx
  lea    (%r8,%rsi,1),%rdx
  add    0x28(%rsp),%rsi
  call   <build>
  mov    0x28(%rsp),%rax
  movslq 0x30(%rsp),%r10
  mov    0x20(%rsp),%rcx
  movslq 0x4c(%rsp),%r9
  movzbl (%rax),%eax
  mov    %al,-0x1(%rcx,%r10,1)
L69:
  movzbl (%r14),%eax
  mov    0x18(%rsp),%rdx
  mov    %al,-0x1(%rdx,%r9,1)
L4:
  movzbl 0x0(%r13),%edx
  movslq 0x10(%rsp),%rax
  mov    0x8(%rsp),%rcx
  mov    %dl,-0x1(%rcx,%rax,1)
L145:
  movzbl (%r12),%eax
  mov    (%rsp),%rcx
  movslq %r15d,%r15
  mov    %al,-0x1(%rcx,%r15,1)
L156:
  movzbl (%rbx),%edx
  movslq 0x48(%rsp),%rax
  mov    %dl,-0x1(%rbp,%rax,1)
L36:
  add    $0x58,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
void build(int n, char *s1, char *s2, char *s3) {
  if (n <= 0) {
    return;
  }
  int p = strchr(s2, s1[0]) - s2;
  build(p, s1 + 1, s2, s3);
  build(n - p - 1, s1 + 1 + p, s2 + p + 1, s3 + p);
  s3[n - 1] = s1[0];
}
```