user: What is the c source code of the assembly code below:

```asm
<main>:
  endbr64
  push   %rbp
  lea    D21(%rip),%rdi
  push   %rbx
  sub    $0x38,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x28(%rsp)
  xor    %eax,%eax
  mov    %rsp,%rbx
  call   <printf@plt>
  lea    D4(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  lea    D105(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  lea    D86(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  lea    D49(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  lea    D50(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  lea    D11(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  lea    D51(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  lea    D92(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  lea    D6(%rip),%rdi
  mov    %rbx,%rsi
  call   <scanf@plt>
  movsbl (%rsp),%edi
  test   %dil,%dil
  je     L71
  lea    D52(%rip),%rbp
  nopl   0x0(%rax,%rax,1)
L27:
  call   <toupper@plt>
  cmp    $0x41,%al
  je     L155
  movsbl (%rbx),%edi
  cmp    $0x43,%al
  je     L155
  cmp    $0x42,%dil
  je     L155
  lea    -0x44(%rax),%edx
  cmp    $0x2,%dl
  jbe    L90
  sub    $0x47,%eax
  cmp    $0x13,%al
  ja     L94
  movzbl %al,%eax
  movslq 0x0(%rbp,%rax,4),%rax
  add    %rbp,%rax
  notrack jmp *%rax
  nopw   0x0(%rax,%rax,1)
L155:
  mov    $0x32,%edi
  call   <putchar@plt>
L49:
  movsbl 0x1(%rbx),%edi
  add    $0x1,%rbx
  test   %dil,%dil
  jne    L27
L71:
  mov    0x28(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L134
  add    $0x38,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  ret
L90:
  mov    $0x33,%edi
  call   <putchar@plt>
  jmp    L49
  mov    $0x37,%edi
  call   <putchar@plt>
  jmp    L49
  mov    $0x39,%edi
  call   <putchar@plt>
  jmp    L49
  mov    $0x35,%edi
  call   <putchar@plt>
  jmp    L49
  mov    $0x34,%edi
  call   <putchar@plt>
  jmp    L49
  mov    $0x36,%edi
  call   <putchar@plt>
  jmp    L49
  mov    $0x38,%edi
  call   <putchar@plt>
  jmp    L49
L94:
  call   <putchar@plt>
  jmp    L49
L134:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: unpack_data
arguments: label: D21
type_infered: string
name: unpack_data
arguments: label: D4
type_infered: string
name: unpack_data
arguments: label: D105
type_infered: string
name: unpack_data
arguments: label: D86
type_infered: string
name: unpack_data
arguments: label: D49
type_infered: string
name: unpack_data
arguments: label: D50
type_infered: string
name: unpack_data
arguments: label: D11
type_infered: string
name: unpack_data
arguments: label: D51
type_infered: string
name: unpack_data
arguments: label: D92
type_infered: string
name: unpack_data
arguments: label: D6
type_infered: string

tool: D21: Pressione A B C para 2

tool: D4: 
Pressione D E F para 3

tool: D105: 
Pressione G H I para 4

tool: D86: 
Pressione J K L para 5

tool: D49: 
Pressione M N O para 6

tool: D50: 
Pressione P Q R S para 7

tool: D11: 
Pressione T U V para 8

tool: D51: 
Pressione W X Y Z para 9

tool: D92: 

Informe as letras: 

tool: D6: %s

assistant: ```c
int main() {
  char texto[30];
  printf("Pressione A B C para 2");
  printf("\nPressione D E F para 3");
  printf("\nPressione G H I para 4");
  printf("\nPressione J K L para 5");
  printf("\nPressione M N O para 6");
  printf("\nPressione P Q R S para 7");
  printf("\nPressione T U V para 8");
  printf("\nPressione W X Y Z para 9");
  printf("\n\nInforme as letras: ");
  scanf("%s", texto);
  for (int i = 0; texto[i] != '\0'; i++) {
    char letra = toupper(texto[i]);
    if (letra == 'A' || texto[i] == 'B' || letra == 'C')
      printf("2");
    else if (letra == 'D' || letra == 'E' || letra == 'F')
      printf("3");
    else if (letra == 'G' || letra == 'H' || letra == 'I')
      printf("4");
    else if (letra == 'J' || letra == 'K' || letra == 'L')
      printf("5");
    else if (letra == 'M' || letra == 'N' || letra == 'O')
      printf("6");
    else if (letra == 'P' || letra == 'Q' || letra == 'R' || letra == 'S')
      printf("7");
    else if (letra == 'T' || letra == 'U' || letra == 'V')
      printf("8");
    else if (letra == 'W' || letra == 'X' || letra == 'Y' || letra == 'Z')
      printf("9");
    else
      printf("%c", texto[i]);
  }
}
```