user: 请显示与下面列出的汇编代码相匹配的C语言实现：

```asm
<Characters__combine_accent>:
  endbr64
  sub    $0x300,%edi
  cmp    $0x27,%edi
  ja     L24
  lea    D25(%rip),%rdx
  movslq (%rdx,%rdi,4),%rax
  add    %rdx,%rax
  notrack jmp *%rax
L24:
  mov    $0x3f,%eax
L59:
  ret
  cs nopw 0x0(%rax,%rax,1)
  mov    $0xc7,%eax
  cmp    $0x43,%esi
  je     L59
  cmp    $0x63,%esi
  mov    $0xe7,%edx
  mov    $0x3f,%eax
  cmove  %edx,%eax
  ret
  nopl   0x0(%rax,%rax,1)
  sub    $0x41,%esi
  cmp    $0x34,%esi
  ja     L24
  lea    D15(%rip),%rdx
  movslq (%rdx,%rsi,4),%rax
  add    %rdx,%rax
  notrack jmp *%rax
  nopl   0x0(%rax)
  sub    $0x41,%esi
  cmp    $0x38,%esi
  ja     L24
  lea    D48(%rip),%rdx
  movslq (%rdx,%rsi,4),%rax
  add    %rdx,%rax
  notrack jmp *%rax
  nopl   0x0(%rax)
  sub    $0x41,%esi
  cmp    $0x34,%esi
  ja     L24
  lea    D7(%rip),%rdx
  movslq (%rdx,%rsi,4),%rax
  add    %rdx,%rax
  notrack jmp *%rax
  nopl   0x0(%rax)
  sub    $0x41,%esi
  cmp    $0x2e,%esi
  ja     L24
  lea    D21(%rip),%rdx
  movslq (%rdx,%rsi,4),%rax
  add    %rdx,%rax
  notrack jmp *%rax
  nopl   (%rax)
  sub    $0x41,%esi
  cmp    $0x34,%esi
  ja     L24
  lea    D31(%rip),%rdx
  movslq (%rdx,%rsi,4),%rax
  add    %rdx,%rax
  notrack jmp *%rax
  mov    $0xf5,%eax
  ret
  mov    $0xe3,%eax
  ret
  mov    $0xd5,%eax
  ret
  mov    $0xd1,%eax
  ret
  mov    $0xc3,%eax
  ret
  mov    $0xf1,%eax
  ret
  mov    $0xfb,%eax
  ret
  mov    $0xf4,%eax
  ret
  mov    $0xee,%eax
  ret
  mov    $0xe2,%eax
  ret
  mov    $0xdb,%eax
  ret
  mov    $0xd4,%eax
  ret
  mov    $0xce,%eax
  ret
  mov    $0xca,%eax
  ret
  mov    $0xc2,%eax
  ret
  mov    $0xf9,%eax
  ret
  mov    $0xf2,%eax
  ret
  mov    $0xec,%eax
  ret
  mov    $0xe0,%eax
  ret
  mov    $0xd9,%eax
  ret
  mov    $0xd2,%eax
  ret
  mov    $0xcc,%eax
  ret
  mov    $0xc8,%eax
  ret
  mov    $0xc0,%eax
  ret
  mov    $0xfc,%eax
  ret
  mov    $0xf6,%eax
  ret
  mov    $0xef,%eax
  ret
  mov    $0xe4,%eax
  ret
  mov    $0xdc,%eax
  ret
  mov    $0xd6,%eax
  ret
  mov    $0xcf,%eax
  ret
  mov    $0xcb,%eax
  ret
  mov    $0xc4,%eax
  ret
  mov    $0xe8,%eax
  ret
  mov    $0xeb,%eax
  ret
  mov    $0xea,%eax
  ret
  mov    $0xff,%eax
  ret
  mov    $0xfa,%eax
  ret
  mov    $0xf3,%eax
  ret
  mov    $0xd3,%eax
  ret
  mov    $0xcd,%eax
  ret
  mov    $0xc9,%eax
  ret
  mov    $0xc1,%eax
  ret
  mov    $0xed,%eax
  ret
  mov    $0xe1,%eax
  ret
  mov    $0xda,%eax
  ret
  mov    $0xe9,%eax
  ret
```

assistant: ```c
int Characters__combine_accent(int accent, int letter) {
  switch (accent) {
  case 0x0300:
    switch (letter) {
    case 'a':
      return 0xE0;
    case 'e':
      return 0xE8;
    case 'i':
      return 0xEC;
    case 'o':
      return 0xF2;
    case 'u':
      return 0xF9;
    case 'A':
      return 0xC0;
    case 'E':
      return 0xC8;
    case 'I':
      return 0xCC;
    case 'O':
      return 0xD2;
    case 'U':
      return 0xD9;
    }
    break;
  case 0x0301:
    switch (letter) {
    case 'a':
      return 0xE1;
    case 'e':
      return 0xE9;
    case 'i':
      return 0xED;
    case 'o':
      return 0xF3;
    case 'u':
      return 0xFA;
    case 'y':
      return 0xFF;
    case 'A':
      return 0xC1;
    case 'E':
      return 0xC9;
    case 'I':
      return 0xCD;
    case 'O':
      return 0xD3;
    case 'U':
      return 0xDA;
    }
    break;
  case 0x0302:
    switch (letter) {
    case 'a':
      return 0xE2;
    case 'e':
      return 0xEA;
    case 'i':
      return 0xEE;
    case 'o':
      return 0xF4;
    case 'u':
      return 0xFB;
    case 'A':
      return 0xC2;
    case 'E':
      return 0xCA;
    case 'I':
      return 0xCE;
    case 'O':
      return 0xD4;
    case 'U':
      return 0xDB;
    }
    break;
  case 0x0303:
    switch (letter) {
    case 'a':
      return 0xE3;
    case 'n':
      return 0xF1;
    case 'o':
      return 0xF5;
    case 'A':
      return 0xC3;
    case 'N':
      return 0xD1;
    case 'O':
      return 0xD5;
    }
    break;
  case 0x0308:
    switch (letter) {
    case 'a':
      return 0xE4;
    case 'e':
      return 0xEB;
    case 'u':
      return 0xFC;
    case 'o':
      return 0xF6;
    case 'i':
      return 0xEF;
    case 'A':
      return 0xC4;
    case 'E':
      return 0xCB;
    case 'U':
      return 0xDC;
    case 'O':
      return 0xD6;
    case 'I':
      return 0xCF;
    }
    break;
  case 0x0327:
    switch (letter) {
    case 'c':
      return 0xE7;
    case 'C':
      return 0xC7;
    }
    break;
  }
  return '?';
}
```