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

```asm
<main>:
  endbr64
  push   %rbp
  push   %rbx
  lea    -0x64000(%rsp),%r11
L18:
  sub    $0x1000,%rsp
  orq    $0x0,(%rsp)
  cmp    %r11,%rsp
  jne    L18
  sub    $0x28,%rsp
  mov    $0x19000,%edi
  mov    %fs:0x28,%rax
  mov    %rax,0x64018(%rsp)
  xor    %eax,%eax
  lea    0x10(%rsp),%rbx
  call   <malloc@plt>
  xor    %esi,%esi
  mov    $0x64000,%edx
  mov    %rbx,%rdi
  mov    %rax,%rbp
  call   <memset@plt>
  lea    0xc(%rsp),%rdx
  lea    0x8(%rsp),%rsi
  xor    %eax,%eax
  lea    D29(%rip),%rdi
  call   <scanf@plt>
  xor    %eax,%eax
  mov    %rbp,%rsi
  lea    D22(%rip),%rdi
  call   <scanf@plt>
  movslq 0x8(%rsp),%rdx
  mov    0xc(%rsp),%r10d
  mov    %edx,%r9d
  mov    %edx,%ecx
  shr    $0x1f,%r9d
  and    $0x1,%ecx
  add    %edx,%r9d
  sar    %r9d
  cmp    $0x1,%ecx
  mov    %r9d,%ecx
  sbb    $0xffffffff,%ecx
  test   %r10d,%r10d
  je     L49
  lea    -0x1(%r9),%eax
  test   %eax,%eax
  js     L107
  mov    %rbp,%rdi
  cltq
  movslq %ecx,%rsi
  add    %ecx,%r9d
  neg    %rdi
  add    %rbp,%rax
  add    %rbp,%rsi
  lea    (%rbx,%rdi,4),%r10
  jmp    L99
  nopl   0x0(%rax)
L243:
  jle    L279
  mov    %r8b,(%rax)
L196:
  mov    0xc(%rsp),%edx
  movl   $0x1,(%r10,%rsi,4)
  add    $0x1,%ecx
  movl   $0x1,(%r10,%rax,4)
  lea    -0x1(%rdx),%edi
  movslq 0x8(%rsp),%rdx
  mov    %edi,0xc(%rsp)
  test   %edi,%edi
  je     L49
L31:
  sub    $0x1,%rax
  add    $0x1,%rsi
  cmp    %ecx,%r9d
  je     L107
L99:
  cmp    %edx,%ecx
  jge    L107
  movzbl (%rsi),%r8d
  movzbl (%rax),%edi
  cmp    %dil,%r8b
  jne    L243
  mov    0xc(%rsp),%edi
  add    $0x1,%ecx
  test   %edi,%edi
  jne    L31
  nopl   0x0(%rax,%rax,1)
L49:
  lea    -0x1(%rbp,%rdx,1),%rax
  cmp    %rax,%rbp
  ja     L13
  mov    %rbp,%rdx
  jmp    L134
  nopl   0x0(%rax,%rax,1)
L140:
  add    $0x1,%rdx
  sub    $0x1,%rax
  cmp    %rax,%rdx
  ja     L13
L134:
  movzbl (%rax),%ebx
  cmp    %bl,(%rdx)
  je     L140
  lea    D24(%rip),%rdi
  call   <puts@plt>
L93:
  mov    %rbp,%rdi
  call   <free@plt>
  mov    0x64018(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L232
  add    $0x64028,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  ret
  nopw   0x0(%rax,%rax,1)
L279:
  mov    %dil,(%rsi)
  jmp    L196
L107:
  sub    $0x1,%edx
  test   %edx,%edx
  jle    L275
  imul   $0xfffffffffffffffc,%rbp,%rcx
  movslq %edx,%rsi
  mov    %rbp,%rax
  add    %rbp,%rsi
  add    %rcx,%rbx
  xor    %ecx,%ecx
  jmp    L9
  nopl   0x0(%rax,%rax,1)
L127:
  cmpb   $0x39,(%rax)
  je     L177
  movb   $0x39,(%rax)
  movb   $0x39,(%rsi)
  subl   $0x1,0xc(%rsp)
L177:
  add    $0x1,%ecx
  sub    $0x1,%edx
  add    $0x1,%rax
  sub    $0x1,%rsi
  cmp    %edx,%ecx
  jge    L268
L9:
  mov    0xc(%rsp),%edi
  test   %edi,%edi
  je     L175
  mov    (%rbx,%rax,4),%r8d
  test   %r8d,%r8d
  jne    L127
  cmp    $0x1,%edi
  jle    L177
  cmpb   $0x39,(%rax)
  je     L177
  movb   $0x39,(%rax)
  movb   $0x39,(%rsi)
  subl   $0x2,0xc(%rsp)
  jmp    L177
L275:
  xor    %ecx,%ecx
L268:
  cmp    %ecx,%edx
  je     L108
L175:
  movslq 0x8(%rsp),%rdx
  jmp    L49
L13:
  mov    %rbp,%rdi
  call   <puts@plt>
  jmp    L93
L108:
  cmpl   $0x0,0xc(%rsp)
  je     L175
  movslq %edx,%rdx
  movb   $0x39,0x0(%rbp,%rdx,1)
  jmp    L175
L232:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: retrieve_data
arguments: label: D29
type_guessed: string
name: retrieve_data
arguments: label: D22
type_guessed: string
name: retrieve_data
arguments: label: D24
type_guessed: string

tool: D29: %d %d

tool: D22: %s

tool: D24: -1

assistant: ```c
int main() {
  int n;
  int k;
  char *number = (char *)malloc(102400 * sizeof(char));
  char *iter = number, *mid, *fh, *sh;
  unsigned int change[102400] = {0};
  int j, i, palin = 1;
  scanf("%d %d", &n, &k);
  scanf("%s", number);
  j = k;
  i = n / 2 - 1;
  j = n / 2;
  if (n % 2)
    j = j + 1;
  while (k && (i >= 0) && (j < n)) {
    sh = &(number[j]);
    fh = &(number[i]);
    if (*sh != *fh) {
      (*sh > *fh) ? (*fh = *sh) : (*sh = *fh);
      change[fh - number] = change[sh - number] = 1;
      k--;
    }
    j++;
    i--;
  }
  if (k) {
    i = 0;
    j = n - 1;
    while (i < j && k) {
      if (change[i] && (number[i] != '9')) {
        number[i] = '9';
        number[j] = '9';
        k--;
      } else if ((k >= 2) && (number[i] != '9')) {
        number[i] = '9';
        number[j] = '9';
        k--;
        k--;
      }
      i++;
      j--;
    }
    if ((i == j) && k) {
      number[i] = '9';
    }
  }
  fh = number;
  sh = number + n - 1;
  while (fh <= sh) {
    if (*fh != *sh) {
      palin = 0;
      break;
    }
    fh++;
    sh--;
  }
  if (palin) {
    printf("%s\n", number);
  } else
    printf("-1\n");
  free(number);
  return 0;
}
```