user: What would the C source look like for the assembly code provided here:

```asm
<do_permute_letters>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x88,%rsp
  mov    %r8d,0x14(%rsp)
  cmp    %esi,%r8d
  je     L395
  mov    %esi,%r11d
  test   %esi,%esi
  jle    L19
  lea    0x1(%r8),%esi
  mov    %r8d,%eax
  mov    %rdi,%r15
  mov    %r11d,%ebx
  mov    %esi,0x2c(%rsp)
  lea    0x2(%r8),%esi
  lea    0x5(%r8),%edi
  add    $0x8,%eax
  mov    %esi,0x28(%rsp)
  lea    0x3(%r8),%esi
  mov    %esi,0x24(%rsp)
  lea    0x4(%r8),%esi
  mov    %esi,0x20(%rsp)
  lea    0x6(%r8),%esi
  mov    %edi,0x1c(%rsp)
  lea    0x7(%r8),%edi
  mov    %esi,0x18(%rsp)
  movslq %r11d,%rsi
  mov    %r15,%r11
  mov    %eax,0x38(%rsp)
  cltq
  mov    %edi,0x3c(%rsp)
  mov    %rsi,0x8(%rsp)
  movq   $0x0,(%rsp)
  mov    %rax,0x78(%rsp)
L33:
  mov    (%rsp),%rax
  mov    (%rdx,%rax,4),%r13d
  test   %r13d,%r13d
  je     L36
L118:
  addq   $0x1,(%rsp)
  mov    (%rsp),%rax
  cmp    0x8(%rsp),%rax
  jne    L33
L19:
  add    $0x88,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax,%rax,1)
L36:
  movzbl (%r11,%rax,1),%esi
  mov    %rax,%rdi
  movslq 0x14(%rsp),%rax
  xor    %r15d,%r15d
  mov    %sil,(%rcx,%rax,1)
  movl   $0x1,(%rdx,%rdi,4)
  cmp    %ebx,0x2c(%rsp)
  je     L261
L69:
  mov    (%rdx,%r15,4),%r12d
  test   %r12d,%r12d
  je     L89
L250:
  add    $0x1,%r15
  cmp    0x8(%rsp),%r15
  jne    L69
  mov    (%rsp),%rax
  movl   $0x0,(%rdx,%rax,4)
  jmp    L118
  cs nopw 0x0(%rax,%rax,1)
L89:
  movzbl (%r11,%r15,1),%esi
  movslq 0x2c(%rsp),%rax
  xor    %r10d,%r10d
  mov    %sil,(%rcx,%rax,1)
  movl   $0x1,(%rdx,%r15,4)
  cmp    0x28(%rsp),%ebx
  je     L307
  mov    %r15,0x70(%rsp)
  mov    %r10,%r15
  mov    0x8(%rsp),%r10
L169:
  mov    (%rdx,%r15,4),%ebp
  test   %ebp,%ebp
  je     L401
L389:
  add    $0x1,%r15
  cmp    %r10,%r15
  jne    L169
  mov    0x70(%rsp),%r15
L144:
  movl   $0x0,(%rdx,%r15,4)
  jmp    L250
L401:
  movzbl (%r11,%r15,1),%esi
  movslq 0x28(%rsp),%rax
  xor    %r9d,%r9d
  mov    %sil,(%rcx,%rax,1)
  movl   $0x1,(%rdx,%r15,4)
  cmp    0x24(%rsp),%ebx
  je     L245
  mov    %r15,0x68(%rsp)
  mov    %r9,%r15
  mov    %r10,%r9
L430:
  mov    (%rdx,%r15,4),%r10d
  test   %r10d,%r10d
  je     L223
L90:
  add    $0x1,%r15
  cmp    %r9,%r15
  jne    L430
  mov    0x68(%rsp),%r15
  mov    %r9,%r10
L278:
  movl   $0x0,(%rdx,%r15,4)
  jmp    L389
  nopw   0x0(%rax,%rax,1)
L223:
  movzbl (%r11,%r15,1),%esi
  movslq 0x24(%rsp),%rax
  xor    %r14d,%r14d
  mov    %sil,(%rcx,%rax,1)
  movl   $0x1,(%rdx,%r15,4)
  cmp    0x20(%rsp),%ebx
  je     L262
  mov    %r15,0x50(%rsp)
  mov    %rdx,%rbp
  mov    %r9,0x58(%rsp)
L119:
  mov    0x0(%rbp,%r14,4),%r8d
  test   %r8d,%r8d
  je     L11
L422:
  add    $0x1,%r14
  cmp    %r14d,%ebx
  jg     L119
  mov    0x50(%rsp),%r15
  mov    0x58(%rsp),%r9
  mov    %rbp,%rdx
L362:
  movl   $0x0,(%rdx,%r15,4)
  jmp    L90
  nopw   0x0(%rax,%rax,1)
L11:
  movzbl (%r11,%r14,1),%edx
  movslq 0x20(%rsp),%rax
  xor    %r15d,%r15d
  mov    %dl,(%rcx,%rax,1)
  movl   $0x1,0x0(%rbp,%r14,4)
  cmp    0x1c(%rsp),%ebx
  je     L152
  mov    %r14,0x48(%rsp)
  mov    %r15,%r14
L87:
  mov    0x0(%rbp,%r14,4),%edi
  test   %edi,%edi
  je     L285
L224:
  add    $0x1,%r14
  cmp    %r14d,%ebx
  jg     L87
  mov    0x48(%rsp),%r14
L325:
  movl   $0x0,0x0(%rbp,%r14,4)
  jmp    L422
  nopl   (%rax)
L285:
  movzbl (%r11,%r14,1),%edx
  movslq 0x1c(%rsp),%rax
  xor    %r15d,%r15d
  mov    %dl,(%rcx,%rax,1)
  movl   $0x1,0x0(%rbp,%r14,4)
  cmp    0x18(%rsp),%ebx
  je     L300
  mov    %r14,0x40(%rsp)
  mov    %r11,%r14
L164:
  mov    0x0(%rbp,%r15,4),%esi
  test   %esi,%esi
  je     L396
L94:
  add    $0x1,%r15
  cmp    %r15d,%ebx
  jg     L164
  mov    %r14,%r11
  mov    0x40(%rsp),%r14
L319:
  movl   $0x0,0x0(%rbp,%r14,4)
  jmp    L224
  nopl   0x0(%rax,%rax,1)
L396:
  movzbl (%r14,%r15,1),%edx
  movslq 0x18(%rsp),%rax
  xor    %r12d,%r12d
  movslq 0x3c(%rsp),%r9
  mov    %dl,(%rcx,%rax,1)
  movl   $0x1,0x0(%rbp,%r15,4)
  cmp    %r9d,%ebx
  je     L382
  mov    %r15,0x30(%rsp)
  mov    %r14,%r15
  mov    %rcx,%r14
L206:
  mov    0x0(%rbp,%r12,4),%edx
  test   %edx,%edx
  je     L272
L268:
  add    $0x1,%r12
  cmp    %r12d,%ebx
  jg     L206
  mov    %r14,%rcx
  mov    %r15,%r14
  mov    0x30(%rsp),%r15
L194:
  movl   $0x0,0x0(%rbp,%r15,4)
  jmp    L94
  nopw   0x0(%rax,%rax,1)
L272:
  movzbl (%r15,%r12,1),%eax
  xor    %r13d,%r13d
  mov    %al,(%r14,%r9,1)
  movl   $0x1,0x0(%rbp,%r12,4)
  cmp    0x38(%rsp),%ebx
  je     L178
L322:
  mov    0x0(%rbp,%r13,4),%eax
  test   %eax,%eax
  je     L256
L418:
  add    $0x1,%r13
  cmp    %r13d,%ebx
  jg     L322
  movl   $0x0,0x0(%rbp,%r12,4)
  jmp    L268
  nopl   0x0(%rax,%rax,1)
L256:
  movzbl (%r15,%r13,1),%eax
  mov    0x78(%rsp),%rsi
  mov    %r14,%rcx
  mov    %rbp,%rdx
  mov    %r15,%rdi
  mov    %r9,0x60(%rsp)
  mov    %al,(%r14,%rsi,1)
  mov    0x14(%rsp),%eax
  mov    %ebx,%esi
  movl   $0x1,0x0(%rbp,%r13,4)
  lea    0x9(%rax),%r8d
  call   <do_permute_letters>
  mov    0x60(%rsp),%r9
  movl   $0x0,0x0(%rbp,%r13,4)
  jmp    L418
  nopl   0x0(%rax)
L178:
  mov    %r14,%rsi
  lea    D35(%rip),%rdi
  mov    %r9,0x60(%rsp)
  call   <printf@plt>
  mov    0x60(%rsp),%r9
  movl   $0x0,0x0(%rbp,%r12,4)
  jmp    L268
  nop
L382:
  mov    %rcx,%rsi
  lea    D35(%rip),%rdi
  mov    %rcx,0x30(%rsp)
  call   <printf@plt>
  mov    0x30(%rsp),%rcx
  jmp    L194
  xchg   %ax,%ax
L300:
  mov    %rcx,%rsi
  lea    D35(%rip),%rdi
  mov    %r11,0x40(%rsp)
  mov    %rcx,0x30(%rsp)
  call   <printf@plt>
  mov    0x30(%rsp),%rcx
  mov    0x40(%rsp),%r11
  jmp    L319
  nopl   0x0(%rax,%rax,1)
L152:
  mov    %rcx,%rsi
  lea    D35(%rip),%rdi
  mov    %r11,0x40(%rsp)
  mov    %rcx,0x30(%rsp)
  call   <printf@plt>
  mov    0x30(%rsp),%rcx
  mov    0x40(%rsp),%r11
  jmp    L325
  nopl   0x0(%rax,%rax,1)
L262:
  mov    %rcx,%rsi
  lea    D35(%rip),%rdi
  mov    %rdx,0x50(%rsp)
  mov    %r11,0x48(%rsp)
  mov    %r9,0x40(%rsp)
  mov    %rcx,0x30(%rsp)
  call   <printf@plt>
  mov    0x30(%rsp),%rcx
  mov    0x40(%rsp),%r9
  mov    0x48(%rsp),%r11
  mov    0x50(%rsp),%rdx
  jmp    L362
  nopl   0x0(%rax)
L245:
  mov    %rcx,%rsi
  lea    D35(%rip),%rdi
  mov    %rdx,0x50(%rsp)
  mov    %r11,0x48(%rsp)
  mov    %r10,0x40(%rsp)
  mov    %rcx,0x30(%rsp)
  call   <printf@plt>
  mov    0x30(%rsp),%rcx
  mov    0x40(%rsp),%r10
  mov    0x48(%rsp),%r11
  mov    0x50(%rsp),%rdx
  jmp    L278
  nopl   0x0(%rax)
L307:
  mov    %rcx,%rsi
  lea    D35(%rip),%rdi
  mov    %rdx,0x48(%rsp)
  mov    %r11,0x40(%rsp)
  mov    %rcx,0x30(%rsp)
  call   <printf@plt>
  mov    0x30(%rsp),%rcx
  mov    0x40(%rsp),%r11
  mov    0x48(%rsp),%rdx
  jmp    L144
  nopw   0x0(%rax,%rax,1)
L261:
  mov    %rcx,%rsi
  lea    D35(%rip),%rdi
  mov    %rdx,0x48(%rsp)
  mov    %r11,0x40(%rsp)
  mov    %rcx,0x30(%rsp)
  call   <printf@plt>
  mov    0x48(%rsp),%rdx
  mov    (%rsp),%rax
  mov    0x30(%rsp),%rcx
  mov    0x40(%rsp),%r11
  movl   $0x0,(%rdx,%rax,4)
  jmp    L118
  nopl   (%rax)
L395:
  add    $0x88,%rsp
  mov    %rcx,%rsi
  lea    D35(%rip),%rdi
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    1050 <printf@plt>
```

tool_calls: name: disassemble_data
arguments: label: D35
datatype: string

tool: D35: %s


assistant: ```c
void do_permute_letters(const char *letters, int len, bool *used, char *buffer, int position) {
  if (position == len) {
    printf("%s\n", buffer);
    return;
  }
  for (int i = 0; i < len; i++) {
    if (!used[i]) {
      buffer[position] = letters[i];
      used[i] = true;
      do_permute_letters(letters, len, used, buffer, position + 1);
      used[i] = false;
    }
  }
}
```