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

```asm
<main>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x420,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  lea    D60(%rip),%rax
  mov    %rax,%rsi
  lea    D39(%rip),%rax
  mov    %rax,%rdi
  call   <fopen@plt>
  mov    %rax,-0x410(%rbp)
  lea    D1(%rip),%rax
  mov    %rax,%rsi
  lea    D102(%rip),%rax
  mov    %rax,%rdi
  call   <fopen@plt>
  mov    %rax,-0x408(%rbp)
  cmpq   $0x0,-0x410(%rbp)
  jne    L79
  lea    D55(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  lea    D109(%rip),%rax
  mov    %rax,%rdi
  call   <system@plt>
  mov    $0x0,%eax
  jmp    L19
L79:
  cmpq   $0x0,-0x408(%rbp)
  jne    L15
  lea    D133(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  lea    D109(%rip),%rax
  mov    %rax,%rdi
  call   <system@plt>
  mov    $0x0,%eax
  jmp    L19
L15:
  lea    D125(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  jmp    L20
L7:
  mov    -0x410(%rbp),%rax
  mov    %rax,%rdi
  call   <fgetc@plt>
  mov    %al,-0x411(%rbp)
  movsbl -0x411(%rbp),%eax
  mov    %eax,%edi
  call   <putchar@plt>
L20:
  mov    -0x410(%rbp),%rax
  mov    %rax,%rdi
  call   <feof@plt>
  test   %eax,%eax
  je     L7
  mov    -0x408(%rbp),%rdx
  mov    -0x410(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <copiar@plt>
  mov    -0x410(%rbp),%rax
  mov    %rax,%rdi
  call   <fclose@plt>
  lea    D60(%rip),%rax
  mov    %rax,%rsi
  lea    D39(%rip),%rax
  mov    %rax,%rdi
  call   <fopen@plt>
  mov    %rax,-0x410(%rbp)
  lea    D64(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  jmp    L62
L3:
  lea    -0x400(%rbp),%rax
  mov    %rax,%rsi
  lea    D34(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
L62:
  mov    -0x410(%rbp),%rdx
  lea    -0x400(%rbp),%rax
  mov    $0x3e9,%esi
  mov    %rax,%rdi
  call   <fgets@plt>
  test   %rax,%rax
  jne    L3
  mov    $0xa,%edi
  call   <putchar@plt>
  mov    -0x410(%rbp),%rax
  mov    %rax,%rdi
  call   <fclose@plt>
  mov    -0x408(%rbp),%rax
  mov    %rax,%rdi
  call   <fclose@plt>
  lea    D109(%rip),%rax
  mov    %rax,%rdi
  call   <system@plt>
  mov    $0x0,%eax
L19:
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L53
  call   <__stack_chk_fail@plt>
L53:
  leave
  ret
```

tool_calls: name: unpack_data
arguments: tag: D60
datatype: string
name: unpack_data
arguments: tag: D39
datatype: string
name: unpack_data
arguments: tag: D1
datatype: string
name: unpack_data
arguments: tag: D102
datatype: string
name: unpack_data
arguments: tag: D55
datatype: string
name: unpack_data
arguments: tag: D109
datatype: string
name: unpack_data
arguments: tag: D133
datatype: string
name: unpack_data
arguments: tag: D125
datatype: string
name: unpack_data
arguments: tag: D64
datatype: string
name: unpack_data
arguments: tag: D34
datatype: string

tool: D60: r

tool: D39: input.txt

tool: D1: w

tool: D102: output.txt

tool: D55: 
Erro na abertura do arquivo A!!!


tool: D109: pause

tool: D133: 
Erro na abertura do arquivo B!!!


tool: D125: 	Texto presente no arquivo A.txt:


tool: D64: 

	Texto copiado para o arquivo B.txt:


tool: D34: %s

assistant: ```c
int main() {
  FILE *tx, *tx2;
  char c, texto[1001];
  tx = fopen("input.txt", "r");
  tx2 = fopen("output.txt", "w");
  if (!tx) {
    printf("\nErro na abertura do arquivo A!!!\n\n");
    system("pause");
    return (0);
  }
  if (!tx2) {
    printf("\nErro na abertura do arquivo B!!!\n\n");
    system("pause");
    return (0);
  }
  printf("\tTexto presente no arquivo A.txt:\n\n");
  while (!feof(tx)) {
    c = fgetc(tx);
    printf("%c", c);
  }
  copiar(tx, tx2);
  fclose(tx);
  tx = fopen("input.txt", "r");
  printf("\n\n\tTexto copiado para o arquivo B.txt:\n\n");
  while (fgets(texto, 1001, tx) != NULL)
    printf("%s", texto);
  printf("\n");
  fclose(tx);
  fclose(tx2);
  system("pause");
  return (0);
}
```