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

```asm
<Fib>:
  endbr64
  push   %r15
  lea    D3(%rip),%r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x48,%rsp
  mov    %edi,0x28(%rsp)
  movl   $0x0,0x10(%rsp)
L39:
  mov    0x28(%rsp),%ebx
  mov    %r15,%rdi
  mov    %ebx,%esi
  call   <printf@plt>
  cmp    $0x1,%ebx
  jle    L178
  mov    0x28(%rsp),%eax
  movl   $0x0,0x14(%rsp)
  lea    -0x1(%rax),%r14d
L173:
  mov    %r14d,%esi
  mov    %r15,%rdi
  call   <printf@plt>
  cmp    $0x1,%r14d
  jle    L41
  lea    -0x1(%r14),%eax
  movl   $0x0,0x1c(%rsp)
  mov    %eax,0x18(%rsp)
  mov    %r14d,0x38(%rsp)
L23:
  mov    0x18(%rsp),%ebx
  mov    %r15,%rdi
  mov    %ebx,%esi
  call   <printf@plt>
  cmp    $0x1,%ebx
  jle    L133
  mov    0x18(%rsp),%eax
  movl   $0x0,0x24(%rsp)
  sub    $0x1,%eax
  mov    %eax,0x20(%rsp)
L8:
  mov    0x20(%rsp),%ebx
  mov    %r15,%rdi
  mov    %ebx,%esi
  call   <printf@plt>
  cmp    $0x1,%ebx
  jle    L70
  mov    0x20(%rsp),%eax
  xor    %r12d,%r12d
  lea    -0x1(%rax),%r14d
L108:
  mov    %r14d,%esi
  mov    %r15,%rdi
  call   <printf@plt>
  cmp    $0x1,%r14d
  jle    L161
  xor    %r13d,%r13d
  mov    %r12d,0x8(%rsp)
  lea    -0x1(%r14),%ebx
  mov    %r13d,%r12d
L158:
  mov    %ebx,%esi
  mov    %r15,%rdi
  call   <printf@plt>
  cmp    $0x1,%ebx
  jle    L122
  movl   $0x0,0xc(%rsp)
  lea    -0x1(%rbx),%ebp
  mov    %ebx,0x2c(%rsp)
  mov    %ebp,%r13d
  mov    %r12d,0x30(%rsp)
L28:
  mov    %r13d,%esi
  mov    %r15,%rdi
  call   <printf@plt>
  cmp    $0x1,%r13d
  jle    L22
  lea    -0x2(%r13),%eax
  xor    %ebx,%ebx
  mov    %r14d,0x3c(%rsp)
  lea    -0x1(%r13),%r12d
  mov    %eax,0x34(%rsp)
  mov    %eax,%ebp
  mov    %ebx,%r14d
L63:
  mov    %r12d,%esi
  mov    %r15,%rdi
  call   <printf@plt>
  cmp    $0x1,%r12d
  jle    L152
  mov    %ebp,%ebx
  mov    %r15,%rdi
  xor    %r13d,%r13d
  mov    %ebx,%esi
  call   <printf@plt>
  cmp    $0x1,%ebx
  jle    L169
L163:
  lea    -0x1(%rbx),%edi
  sub    $0x2,%ebx
  call   <Fib>
  mov    %ebx,%esi
  mov    %r15,%rdi
  add    %eax,%r13d
  call   <printf@plt>
  cmp    $0x1,%ebx
  jg     L163
  nopl   0x0(%rax,%rax,1)
L169:
  sub    $0x2,%r12d
  lea    0x1(%r14,%r13,1),%r14d
  sub    $0x2,%ebp
  jmp    L63
L122:
  mov    %r12d,%r13d
  mov    0x8(%rsp),%r12d
  sub    $0x2,%r14d
  lea    0x1(%r12,%r13,1),%r12d
  jmp    L108
  nopl   0x0(%rax)
L22:
  mov    0x2c(%rsp),%ebx
  mov    0x30(%rsp),%r12d
  mov    0xc(%rsp),%eax
  sub    $0x2,%ebx
  lea    0x1(%r12,%rax,1),%r12d
  jmp    L158
L161:
  mov    0x24(%rsp),%eax
  subl   $0x2,0x20(%rsp)
  lea    0x1(%rax,%r12,1),%eax
  mov    %eax,0x24(%rsp)
  jmp    L8
  nopl   0x0(%rax)
L152:
  mov    0xc(%rsp),%eax
  mov    %r14d,%ebx
  mov    0x34(%rsp),%r13d
  mov    0x3c(%rsp),%r14d
  lea    0x1(%rax,%rbx,1),%eax
  mov    %eax,0xc(%rsp)
  jmp    L28
L70:
  mov    0x1c(%rsp),%eax
  mov    0x24(%rsp),%edx
  subl   $0x2,0x18(%rsp)
  lea    0x1(%rax,%rdx,1),%eax
  mov    %eax,0x1c(%rsp)
  jmp    L23
L133:
  mov    0x14(%rsp),%eax
  mov    0x1c(%rsp),%ecx
  mov    0x38(%rsp),%r14d
  lea    0x1(%rax,%rcx,1),%eax
  mov    %eax,0x14(%rsp)
  sub    $0x2,%r14d
  jmp    L173
L178:
  mov    0x10(%rsp),%eax
  add    $0x48,%rsp
  pop    %rbx
  pop    %rbp
  add    $0x1,%eax
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L41:
  mov    0x10(%rsp),%eax
  mov    0x14(%rsp),%edx
  subl   $0x2,0x28(%rsp)
  lea    0x1(%rax,%rdx,1),%eax
  mov    %eax,0x10(%rsp)
  jmp    L39
```

tool_calls: name: read_data
arguments: data_tag: D3
type: string

tool: D3: Fib(%d)


assistant: ```c
int Fib(int val) {
  printf("Fib(%d)\n", val);
  if (val < 2)
    return 1;
  return Fib(val - 1) + Fib(val - 2);
}
```