user: 请从给定的汇编指令推导出C源代码：

```asm
<main>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x8,%rsp
  cmp    $0x2,%edi
  jne    L41
  mov    0x8(%rsi),%rcx
  mov    %rsi,%rbp
  xor    %ebx,%ebx
  lea    D49(%rip),%r14
  lea    D84(%rip),%r12
  lea    D78(%rip),%r15
  movsbl (%rcx),%edx
  lea    D6(%rip),%r13
  test   %dl,%dl
  je     L109
  nopw   0x0(%rax,%rax,1)
L89:
  lea    -0x41(%rdx),%eax
  mov    %ebx,%esi
  cmp    $0x38,%al
  ja     L0
  movzbl %al,%eax
  movslq (%r12,%rax,4),%rax
  add    %r12,%rax
  notrack jmp *%rax
  cs nopw 0x0(%rax,%rax,1)
L0:
  mov    %r14,%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    0x8(%rbp),%rcx
  xchg   %ax,%ax
L98:
  add    $0x1,%rbx
  movsbl (%rcx,%rbx,1),%edx
  test   %dl,%dl
  jne    L89
L109:
  xor    %eax,%eax
L90:
  add    $0x8,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   (%rax)
  cmp    $0x2,%rbx
  jbe    L98
  mov    %r15,%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    0x8(%rbp),%rcx
  jmp    L98
  cs nopw 0x0(%rax,%rax,1)
  mov    %r13,%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    0x8(%rbp),%rcx
  jmp    L98
  lea    D17(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    0x8(%rbp),%rcx
  jmp    L98
  nopl   0x0(%rax)
  lea    D45(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    0x8(%rbp),%rcx
  jmp    L98
  nopl   0x0(%rax)
  lea    D21(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    0x8(%rbp),%rcx
  jmp    L98
  nopw   0x0(%rax,%rax,1)
  lea    D20(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    0x8(%rbp),%rcx
  jmp    L98
L41:
  lea    D23(%rip),%rdi
  call   <puts@plt>
  mov    $0x1,%eax
  jmp    L90
```

tool_calls: name: disassemble_data
arguments: data_label: D49
data_type: string
name: disassemble_data
arguments: data_label: D78
data_type: string
name: disassemble_data
arguments: data_label: D6
data_type: string
name: disassemble_data
arguments: data_label: D17
data_type: string
name: disassemble_data
arguments: data_label: D45
data_type: string
name: disassemble_data
arguments: data_label: D21
data_type: string
name: disassemble_data
arguments: data_label: D20
data_type: string
name: disassemble_data
arguments: data_label: D23
data_type: string

tool: D49: %d: %c is not a vowel


tool: D78: %d: 'Y'


tool: D6: %d: 'U'


tool: D17: %d: 'O'


tool: D45: %d: 'I'


tool: D21: %d: 'E'


tool: D20: %d: 'A'


tool: D23: ERROR: you need one argument.

assistant: ```c
int main(int argc, char *argv[]) {
  if (argc != 2) {
    printf("ERROR: you need one argument.\n");
    return 1;
  }
  int i = 0;
  for (i = 0; argv[1][i] != '\0'; i++) {
    char letter = argv[1][i];
    switch (letter) {
    case 'a':
    case 'A':
      printf("%d: 'A'\n", i);
      break;
    case 'e':
    case 'E':
      printf("%d: 'E'\n", i);
      break;
    case 'i':
    case 'I':
      printf("%d: 'I'\n", i);
      break;
    case 'o':
    case 'O':
      printf("%d: 'O'\n", i);
      break;
    case 'u':
    case 'U':
      printf("%d: 'U'\n", i);
      break;
    case 'y':
    case 'Y':
      if (i > 2) {
        printf("%d: 'Y'\n", i);
      }
      break;
    default:
      printf("%d: %c is not a vowel\n", i, letter);
    }
  }
  return 0;
}
```