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

```asm
<newton>:
  endbr64
  test   %esi,%esi
  je     L327
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x68,%rsp
  cmp    %esi,%edi
  sete   %al
  cmp    $0x1,%esi
  movl   $0x0,0x1c(%rsp)
  sete   0x3b(%rsp)
  test   %al,%al
  jne    L47
  mov    %edi,%r9d
  mov    %esi,%r11d
L56:
  mov    %r9d,%eax
  sub    $0x1,%r9d
  cmp    %eax,%r11d
  je     L293
  cmpb   $0x0,0x3b(%rsp)
  jne    L293
  mov    %r11d,%eax
  movl   $0x0,0x20(%rsp)
  sub    $0x2,%eax
  mov    %r9d,0x18(%rsp)
  mov    %eax,0x2c(%rsp)
  mov    %r9d,0x3c(%rsp)
  mov    %r11d,%r9d
  sete   0x5c(%rsp)
L206:
  mov    0x18(%rsp),%eax
  mov    %eax,0x34(%rsp)
  sub    $0x1,%eax
  mov    %eax,0x18(%rsp)
  cmp    0x2c(%rsp),%eax
  je     L19
  cmpb   $0x0,0x5c(%rsp)
  jne    L19
  mov    %r9d,%eax
  movl   $0x0,0x24(%rsp)
  sub    $0x3,%eax
  mov    %eax,0x30(%rsp)
  mov    0x18(%rsp),%eax
  sete   0x5d(%rsp)
  mov    %eax,0x8(%rsp)
L40:
  subl   $0x1,0x8(%rsp)
  mov    0x8(%rsp),%eax
  cmp    0x30(%rsp),%eax
  je     L39
  cmpb   $0x0,0x5d(%rsp)
  jne    L39
  mov    %r9d,%eax
  movl   $0x0,0x28(%rsp)
  mov    %r9d,%r11d
  sub    $0x4,%eax
  mov    %eax,0x10(%rsp)
  mov    0x8(%rsp),%eax
  sete   0x5e(%rsp)
  mov    %eax,0xc(%rsp)
L192:
  subl   $0x1,0xc(%rsp)
  mov    0xc(%rsp),%eax
  cmp    0x10(%rsp),%eax
  je     L227
  cmpb   $0x0,0x5e(%rsp)
  jne    L227
  mov    %r11d,%eax
  mov    0xc(%rsp),%r9d
  mov    %r11d,%r13d
  sub    $0x5,%eax
  mov    %eax,(%rsp)
  mov    %r9d,%ebx
  sete   0x38(%rsp)
  xor    %r10d,%r10d
  mov    %r10d,%r11d
L241:
  sub    $0x1,%ebx
  cmp    (%rsp),%ebx
  je     L168
  cmpb   $0x0,0x38(%rsp)
  jne    L168
  mov    %r13d,%eax
  mov    %ebx,%edx
  sub    $0x6,%eax
  mov    %eax,0x14(%rsp)
  sete   0x39(%rsp)
  xor    %r10d,%r10d
L253:
  sub    $0x1,%edx
  cmp    0x14(%rsp),%edx
  je     L2
  cmpb   $0x0,0x39(%rsp)
  jne    L2
  mov    %r13d,%r8d
  mov    %edx,%ecx
  sub    $0x7,%r8d
  sete   %r9b
  xor    %r14d,%r14d
L144:
  sub    $0x1,%ecx
  cmp    %r8d,%ecx
  je     L42
  test   %r9b,%r9b
  jne    L42
  mov    %r13d,%eax
  mov    %ecx,%ebp
  sub    $0x8,%eax
  mov    %eax,0x4(%rsp)
  sete   0x3a(%rsp)
  xor    %r12d,%r12d
L319:
  sub    $0x1,%ebp
  cmp    0x4(%rsp),%ebp
  je     L269
  xor    %r15d,%r15d
  cmpb   $0x0,0x3a(%rsp)
  lea    -0x9(%r13),%esi
  mov    %ebp,%edi
  jne    L269
L167:
  sub    $0x1,%edi
  mov    %r9b,0x5f(%rsp)
  mov    %r8d,0x58(%rsp)
  mov    %ecx,0x54(%rsp)
  mov    %r10d,0x50(%rsp)
  mov    %edx,0x4c(%rsp)
  mov    %r11d,0x48(%rsp)
  mov    %esi,0x44(%rsp)
  mov    %edi,0x40(%rsp)
  call   <newton>
  mov    0x40(%rsp),%edi
  mov    0x44(%rsp),%esi
  add    %eax,%r15d
  cmp    0x4(%rsp),%edi
  mov    0x48(%rsp),%r11d
  mov    0x4c(%rsp),%edx
  mov    0x50(%rsp),%r10d
  mov    0x54(%rsp),%ecx
  mov    0x58(%rsp),%r8d
  movzbl 0x5f(%rsp),%r9d
  jne    L167
  add    $0x1,%r15d
L306:
  add    %r15d,%r12d
  cmp    %r8d,%ebp
  jne    L319
  add    $0x1,%r12d
L317:
  add    %r12d,%r14d
  cmp    0x14(%rsp),%ecx
  jne    L144
  add    $0x1,%r14d
L339:
  add    %r14d,%r10d
  cmp    (%rsp),%edx
  jne    L253
  lea    0x1(%r10),%eax
L74:
  add    %eax,%r11d
  cmp    0x10(%rsp),%ebx
  jne    L241
  mov    %r11d,%r10d
  mov    %r13d,%r11d
  lea    0x1(%r10),%eax
L313:
  add    %eax,0x28(%rsp)
  mov    0x30(%rsp),%esi
  cmp    %esi,0xc(%rsp)
  jne    L192
  mov    0x28(%rsp),%eax
  mov    %r11d,%r9d
  add    $0x1,%eax
L99:
  add    %eax,0x24(%rsp)
  mov    0x2c(%rsp),%esi
  cmp    %esi,0x8(%rsp)
  jne    L40
  mov    0x24(%rsp),%eax
  add    $0x1,%eax
L257:
  add    %eax,0x20(%rsp)
  cmp    0x34(%rsp),%r9d
  jne    L206
  mov    0x20(%rsp),%eax
  mov    %r9d,%r11d
  mov    0x3c(%rsp),%r9d
  add    $0x1,%eax
L290:
  add    %eax,0x1c(%rsp)
  cmp    %r11d,%r9d
  jne    L56
  mov    0x1c(%rsp),%eax
  add    $0x68,%rsp
  pop    %rbx
  pop    %rbp
  add    $0x1,%eax
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L2:
  mov    $0x1,%r14d
  jmp    L339
L42:
  mov    $0x1,%r12d
  jmp    L317
  nopl   0x0(%rax,%rax,1)
L269:
  mov    $0x1,%r15d
  jmp    L306
L168:
  mov    $0x1,%eax
  jmp    L74
L227:
  mov    $0x1,%eax
  jmp    L313
L39:
  mov    $0x1,%eax
  jmp    L99
L19:
  mov    $0x1,%eax
  jmp    L257
L293:
  mov    $0x1,%eax
  jmp    L290
L47:
  add    $0x68,%rsp
  mov    $0x1,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L327:
  mov    $0x1,%eax
  ret
```

assistant: ```c
int newton(int n, int k) {
  if (k == 0 || k == n)
    return 1;
  else
    return newton(n - 1, k - 1) + newton(n - 1, k);
}
```