user: What would the C source look like for the assembly code provided here?

```asm
<ft_fibonacci>:
  endbr64
  test   %edi,%edi
  js     L98
  mov    %edi,%r8d
  je     L294
  cmp    $0x1,%edi
  je     L294
  push   %r15
  xor    %r8d,%r8d
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x38,%rsp
  mov    %edi,0xc(%rsp)
  mov    %r8d,(%rsp)
L246:
  mov    0xc(%rsp),%eax
  lea    -0x1(%rax),%edi
  mov    %edi,0x10(%rsp)
  cmp    $0x2,%eax
  je     L14
  xor    %r11d,%r11d
  mov    %r11d,0x4(%rsp)
L351:
  mov    0x10(%rsp),%eax
  lea    -0x1(%rax),%r11d
  cmp    $0x2,%eax
  je     L240
  xor    %ebx,%ebx
  mov    %ebx,0x8(%rsp)
L376:
  lea    -0x1(%r11),%r10d
  cmp    $0x2,%r11d
  je     L162
  xor    %r9d,%r9d
L220:
  lea    -0x1(%r10),%edx
  cmp    $0x2,%r10d
  je     L26
  xor    %r8d,%r8d
L340:
  lea    -0x1(%rdx),%ebx
  cmp    $0x2,%edx
  je     L27
  xor    %esi,%esi
L178:
  lea    -0x1(%rbx),%r13d
  cmp    $0x2,%ebx
  je     L278
  xor    %r12d,%r12d
  mov    %ebx,%ecx
  nopl   0x0(%rax)
L273:
  lea    -0x1(%r13),%r14d
  cmp    $0x2,%r13d
  je     L362
  xor    %ebp,%ebp
L65:
  lea    -0x1(%r14),%r15d
  cmp    $0x2,%r14d
  je     L229
  mov    %r13d,0x14(%rsp)
  xor    %ebx,%ebx
  mov    %r10d,%r13d
  mov    %r12d,0x18(%rsp)
  mov    %r11d,%r12d
  mov    %r14d,0x1c(%rsp)
  mov    %r9d,%r14d
  mov    %ebp,0x20(%rsp)
  mov    %ecx,%ebp
  jmp    L192
L299:
  cmp    $0x1,%r15d
  je     L258
L192:
  lea    -0x1(%r15),%edi
  mov    %edx,0x2c(%rsp)
  mov    %esi,0x28(%rsp)
  mov    %r8d,0x24(%rsp)
  call   <ft_fibonacci>
  mov    0x24(%rsp),%r8d
  mov    0x28(%rsp),%esi
  add    %eax,%ebx
  sub    $0x2,%r15d
  mov    0x2c(%rsp),%edx
  jne    L299
  mov    %ebp,%ecx
  mov    %r12d,%r11d
  mov    %r13d,%r10d
  mov    %r14d,%r9d
  mov    0x14(%rsp),%r13d
  mov    0x18(%rsp),%r12d
  mov    0x1c(%rsp),%r14d
  mov    0x20(%rsp),%ebp
L361:
  add    %ebx,%ebp
  sub    $0x2,%r14d
  je     L250
  cmp    $0x1,%r14d
  jne    L65
L229:
  add    $0x1,%ebp
L250:
  add    %ebp,%r12d
  sub    $0x2,%r13d
  je     L336
  cmp    $0x1,%r13d
  jne    L273
L362:
  add    $0x1,%r12d
  mov    %ecx,%ebx
  add    %r12d,%esi
  sub    $0x2,%ebx
  je     L236
L58:
  cmp    $0x1,%ebx
  jne    L178
L278:
  mov    %esi,%ebp
  add    $0x1,%ebp
  add    %ebp,%r8d
  sub    $0x2,%edx
  je     L91
L367:
  cmp    $0x1,%edx
  jne    L340
L27:
  mov    %r8d,%ebx
  add    $0x1,%ebx
  add    %ebx,%r9d
  sub    $0x2,%r10d
  je     L146
L139:
  cmp    $0x1,%r10d
  jne    L220
L26:
  mov    %r9d,%ebp
  add    $0x1,%ebp
  add    %ebp,0x8(%rsp)
  sub    $0x2,%r11d
  je     L200
L338:
  cmp    $0x1,%r11d
  jne    L376
L162:
  mov    0x8(%rsp),%ebx
  add    $0x1,%ebx
L93:
  add    %ebx,0x4(%rsp)
  subl   $0x2,0x10(%rsp)
  je     L182
  cmpl   $0x1,0x10(%rsp)
  jne    L351
L240:
  mov    0x4(%rsp),%r11d
  add    $0x1,%r11d
L128:
  add    %r11d,(%rsp)
  subl   $0x2,0xc(%rsp)
  je     L215
  cmpl   $0x1,0xc(%rsp)
  jne    L246
L14:
  mov    (%rsp),%r8d
  add    $0x1,%r8d
L365:
  add    $0x38,%rsp
  mov    %r8d,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L336:
  mov    %ecx,%ebx
  add    %r12d,%esi
  sub    $0x2,%ebx
  jne    L58
L236:
  mov    %esi,%ebp
  add    %ebp,%r8d
  sub    $0x2,%edx
  jne    L367
L91:
  mov    %r8d,%ebx
  add    %ebx,%r9d
  sub    $0x2,%r10d
  jne    L139
L146:
  mov    %r9d,%ebp
  add    %ebp,0x8(%rsp)
  sub    $0x2,%r11d
  jne    L338
L200:
  mov    0x8(%rsp),%ebx
  jmp    L93
  nopl   0x0(%rax,%rax,1)
L258:
  mov    %ebp,%ecx
  mov    %r12d,%r11d
  mov    %r13d,%r10d
  mov    %r14d,%r9d
  mov    0x14(%rsp),%r13d
  mov    0x18(%rsp),%r12d
  add    $0x1,%ebx
  mov    0x1c(%rsp),%r14d
  mov    0x20(%rsp),%ebp
  jmp    L361
L98:
  mov    $0xffffffff,%r8d
L294:
  mov    %r8d,%eax
  ret
L182:
  mov    0x4(%rsp),%r11d
  jmp    L128
L215:
  mov    (%rsp),%r8d
  jmp    L365
```

assistant: ```c
int ft_fibonacci(int index) {
  if (index < 0)
    return (-1);
  else if (index == 0)
    return (0);
  else if (index == 1)
    return (1);
  else
    return (ft_fibonacci(index - 1) + ft_fibonacci(index - 2));
}
```