user: Please show me the C implementation that matches the assembly code listed below:

```asm
<main>:
  endbr64
  push   %r15
  lea    D20(%rip),%rdi
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x28,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x18(%rsp)
  xor    %eax,%eax
  call   <printf@plt>
  lea    0x14(%rsp),%rsi
  lea    D74(%rip),%rdi
  call   <scanf@plt>
  mov    0x14(%rsp),%eax
  lea    -0x1(%rax),%edx
  cmp    $0x12,%edx
  ja     L59
  cmp    $0x1,%eax
  je     L122
  mov    %eax,%ecx
  and    $0x1,%eax
  mov    $0x1,%r12d
  sar    %ecx
  cmp    $0x1,%eax
  lea    D48(%rip),%rbx
  sbb    $0x0,%ecx
  lea    D62(%rip),%r14
  lea    D35(%rip),%r13
  mov    %ecx,0xc(%rsp)
  mov    %ecx,%ebp
  cs nopw 0x0(%rax,%rax,1)
L28:
  xor    %r15d,%r15d
  test   %ebp,%ebp
  je     L5
  nopw   0x0(%rax,%rax,1)
L26:
  mov    %r13,%rdi
  add    $0x1,%r15d
  call   <printf@plt>
  cmp    %ebp,%r15d
  jne    L26
L5:
  xor    %r15d,%r15d
  nopl   0x0(%rax)
L64:
  mov    %rbx,%rdi
  add    $0x1,%r15d
  call   <printf@plt>
  cmp    %r12d,%r15d
  jne    L64
  mov    %r14,%rdi
  sub    $0x1,%ebp
  lea    0x2(%r15),%r12d
  call   <printf@plt>
  cmp    $0xffffffff,%ebp
  jne    L28
  mov    0x14(%rsp),%edx
  mov    0xc(%rsp),%esi
  test   $0x1,%dl
  je     L36
  lea    -0x1(%rsi),%eax
  test   %esi,%esi
  je     L59
L128:
  mov    0xc(%rsp),%ebp
  lea    0x1(%rax,%rax,1),%r12d
  lea    D35(%rip),%r13
  sub    %eax,%ebp
  nopl   0x0(%rax,%rax,1)
L30:
  not    %edx
  and    $0x1,%edx
  mov    %edx,%r15d
  cmp    %ebp,%edx
  jge    L79
  nopl   0x0(%rax)
L40:
  mov    %r13,%rdi
  add    $0x1,%r15d
  call   <printf@plt>
  cmp    %ebp,%r15d
  jne    L40
L79:
  xor    %r15d,%r15d
  nopl   0x0(%rax)
L138:
  mov    %rbx,%rdi
  add    $0x1,%r15d
  call   <printf@plt>
  cmp    %r12d,%r15d
  jne    L138
  mov    %r14,%rdi
  add    $0x1,%ebp
  sub    $0x2,%r12d
  call   <printf@plt>
  mov    0xc(%rsp),%eax
  sub    %ebp,%eax
  cmp    $0xffffffff,%eax
  je     L59
  mov    0x14(%rsp),%edx
  jmp    L30
L122:
  lea    D48(%rip),%rdi
  call   <printf@plt>
  lea    D62(%rip),%rdi
  call   <printf@plt>
  nopl   0x0(%rax)
L59:
  mov    0x18(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L45
  add    $0x28,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L36:
  mov    %esi,%eax
  add    $0x1,%esi
  mov    %esi,0xc(%rsp)
  jmp    L128
L45:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: retrieve_data
arguments: data_label: D20
type_guessed: string
name: retrieve_data
arguments: data_label: D74
type_guessed: string
name: retrieve_data
arguments: data_label: D48
type_guessed: string
name: retrieve_data
arguments: data_label: D62
type_guessed: string
name: retrieve_data
arguments: data_label: D35
type_guessed: string

tool: D20: Enter number of rows: 

tool: D74: %d

tool: D48: *

tool: D62: 


tool: D35:  

assistant: ```c
int main() {
  int i, j, k;
  int rows, max;
  printf("Enter number of rows: ");
  scanf("%d", &rows);
  if (rows < 1 || rows > 19)
    return 0;
  else if (rows == 1) {
    printf("*");
    ;
    printf("\n");
    ;
    return 0;
  }
  max = rows / 2;
  if (rows % 2 == 0)
    max -= 1;
  for (i = 0; i <= max; i++) {
    for (j = 0; j < (max - i); j++)
      printf(" ");
    ;
    for (k = 0; k < (1 + (i * 2)); k++)
      printf("*");
    ;
    printf("\n");
    ;
  }
  if (rows % 2 == 0)
    max += 1;
  for (i = max - 1; i >= 0; i--) {
    if (rows % 2 == 0)
      j = 1;
    else
      j = 0;
    for (; j < (max - i); j++) {
      printf(" ");
      ;
    }
    for (k = 0; k < (1 + (i * 2)); k++)
      printf("*");
    ;
    printf("\n");
    ;
  }
  return 0;
}
```