user: 请从给定的汇编指令推导出C源代码:

```asm
<correct_month>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x18(%rbp)
  mov    %rsi,-0x20(%rbp)
  mov    -0x18(%rbp),%rax
  add    $0x3,%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  lea    -0x30(%rax),%edx
  mov    %edx,%eax
  shl    $0x2,%eax
  add    %edx,%eax
  add    %eax,%eax
  mov    %eax,%edx
  mov    -0x18(%rbp),%rax
  add    $0x4,%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  add    %edx,%eax
  sub    $0x30,%eax
  mov    %eax,-0x4(%rbp)
  mov    -0x18(%rbp),%rax
  add    $0x2,%rax
  movzbl (%rax),%eax
  cmp    $0x34,%al
  je     L209
  mov    -0x18(%rbp),%rax
  add    $0x2,%rax
  movzbl (%rax),%eax
  cmp    $0x30,%al
  je     L209
  mov    -0x18(%rbp),%rax
  add    $0x2,%rax
  movzbl (%rax),%eax
  cmp    $0x32,%al
  jne    L120
L209:
  mov    -0x18(%rbp),%rax
  add    $0x3,%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  sub    $0x31,%eax
  cmp    $0x8,%eax
  ja     L101
  mov    %eax,%eax
  lea    0x0(,%rax,4),%rdx
  lea    D18(%rip),%rax
  mov    (%rdx,%rax,1),%eax
  cltq
  lea    D18(%rip),%rdx
  add    %rdx,%rax
  notrack jmp *%rax
  cmpl   $0x1f,-0x4(%rbp)
  jle    L324
  mov    -0x20(%rbp),%rax
  movl   $0x0,(%rax)
  jmp    L175
L324:
  cmpl   $0x1d,-0x4(%rbp)
  jle    L48
  mov    -0x20(%rbp),%rax
  movl   $0x0,(%rax)
  jmp    L175
L48:
  cmpl   $0x1f,-0x4(%rbp)
  jle    L292
  mov    -0x20(%rbp),%rax
  movl   $0x0,(%rax)
  jmp    L175
L292:
  cmpl   $0x1e,-0x4(%rbp)
  jle    L130
  mov    -0x20(%rbp),%rax
  movl   $0x0,(%rax)
  jmp    L175
L130:
  cmpl   $0x1f,-0x4(%rbp)
  jle    L199
  mov    -0x20(%rbp),%rax
  movl   $0x0,(%rax)
  jmp    L175
L199:
  cmpl   $0x1e,-0x4(%rbp)
  jle    L278
  mov    -0x20(%rbp),%rax
  movl   $0x0,(%rax)
  jmp    L175
L278:
  cmpl   $0x1f,-0x4(%rbp)
  jle    L110
  mov    -0x20(%rbp),%rax
  movl   $0x0,(%rax)
  jmp    L175
L110:
  cmpl   $0x1f,-0x4(%rbp)
  jle    L308
  mov    -0x20(%rbp),%rax
  movl   $0x0,(%rax)
  jmp    L175
L308:
  cmpl   $0x1e,-0x4(%rbp)
  jle    L101
  mov    -0x20(%rbp),%rax
  movl   $0x0,(%rax)
  nop
L175:
  jmp    L101
L120:
  mov    -0x18(%rbp),%rax
  add    $0x2,%rax
  movzbl (%rax),%eax
  cmp    $0x33,%al
  je     L193
  mov    -0x18(%rbp),%rax
  add    $0x2,%rax
  movzbl (%rax),%eax
  cmp    $0x35,%al
  je     L193
  mov    -0x18(%rbp),%rax
  add    $0x2,%rax
  movzbl (%rax),%eax
  cmp    $0x31,%al
  jne    L2
L193:
  mov    -0x18(%rbp),%rax
  add    $0x3,%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  cmp    $0x32,%eax
  je     L297
  cmp    $0x32,%eax
  jg     L2
  cmp    $0x30,%eax
  je     L45
  cmp    $0x31,%eax
  je     L176
  jmp    L2
L45:
  cmpl   $0x1f,-0x4(%rbp)
  jle    L176
  mov    -0x20(%rbp),%rax
  movl   $0x0,(%rax)
  jmp    L2
L176:
  cmpl   $0x1e,-0x4(%rbp)
  jle    L297
  mov    -0x20(%rbp),%rax
  movl   $0x0,(%rax)
  jmp    L2
L297:
  cmpl   $0x1f,-0x4(%rbp)
  jle    L2
  mov    -0x20(%rbp),%rax
  movl   $0x0,(%rax)
  jmp    L2
L101:
  nop
L2:
  nop
  pop    %rbp
  ret
```

assistant: ```c
void correct_month(char *EGN, int *valid) {
  int number = (EGN[3] - 48) * 10 + EGN[4] - 48;
  if (EGN[2] == '4' || EGN[2] == '0' || EGN[2] == '2') {
    switch (EGN[3]) {
    case '1':
      if (number > 31) {
        *valid = 0;
        break;
      }
    case '2':
      if (number > 29) {
        *valid = 0;
        break;
      }
    case '3':
      if (number > 31) {
        *valid = 0;
        break;
      }
    case '4':
      if (number > 30) {
        *valid = 0;
        break;
      }
    case '5':
      if (number > 31) {
        *valid = 0;
        break;
      }
    case '6':
      if (number > 30) {
        *valid = 0;
        break;
      }
    case '7':
      if (number > 31) {
        *valid = 0;
        break;
      }
    case '8':
      if (number > 31) {
        *valid = 0;
        break;
      }
    case '9':
      if (number > 30) {
        *valid = 0;
        break;
      }
    }
  } else {
    if (EGN[2] == '3' || EGN[2] == '5' || EGN[2] == '1') {
      switch (EGN[3]) {
      case '0':
        if (number > 31) {
          *valid = 0;
          break;
        }
      case '1':
        if (number > 30) {
          *valid = 0;
          break;
        }
      case '2':
        if (number > 31) {
          *valid = 0;
          break;
        }
      }
    }
  }
}
```