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

```asm
<internal_fiat_25519_carry>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0xc0,%rsp
  mov    %rdi,-0xb8(%rbp)
  mov    %rsi,-0xc0(%rbp)
  mov    -0xc0(%rbp),%rax
  mov    $0x8,%esi
  mov    %eax,%edi
  call   <_br2_load@plt>
  mov    %rax,-0xb0(%rbp)
  mov    -0xc0(%rbp),%rax
  add    $0x8,%eax
  mov    $0x8,%esi
  mov    %eax,%edi
  call   <_br2_load@plt>
  mov    %rax,-0xa8(%rbp)
  mov    -0xc0(%rbp),%rax
  add    $0x10,%eax
  mov    $0x8,%esi
  mov    %eax,%edi
  call   <_br2_load@plt>
  mov    %rax,-0xa0(%rbp)
  mov    -0xc0(%rbp),%rax
  add    $0x18,%eax
  mov    $0x8,%esi
  mov    %eax,%edi
  call   <_br2_load@plt>
  mov    %rax,-0x98(%rbp)
  mov    -0xc0(%rbp),%rax
  add    $0x20,%eax
  mov    $0x8,%esi
  mov    %eax,%edi
  call   <_br2_load@plt>
  mov    %rax,-0x90(%rbp)
  mov    -0xb0(%rbp),%rax
  mov    %rax,-0x88(%rbp)
  mov    -0x88(%rbp),%rax
  shr    $0x33,%rax
  mov    %rax,%rdx
  mov    -0xa8(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x80(%rbp)
  mov    -0x80(%rbp),%rax
  shr    $0x33,%rax
  mov    %rax,%rdx
  mov    -0xa0(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x78(%rbp)
  mov    -0x78(%rbp),%rax
  shr    $0x33,%rax
  mov    %rax,%rdx
  mov    -0x98(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x70(%rbp)
  mov    -0x70(%rbp),%rax
  shr    $0x33,%rax
  mov    %rax,%rdx
  mov    -0x90(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x68(%rbp)
  movabs $0x7ffffffffffff,%rax
  and    -0x88(%rbp),%rax
  mov    %rax,%rcx
  mov    -0x68(%rbp),%rax
  shr    $0x33,%rax
  mov    %rax,%rdx
  mov    %rdx,%rax
  shl    $0x3,%rax
  add    %rdx,%rax
  add    %rax,%rax
  add    %rdx,%rax
  add    %rcx,%rax
  mov    %rax,-0x60(%rbp)
  mov    -0x60(%rbp),%rax
  shr    $0x33,%rax
  mov    %rax,%rdx
  movabs $0x7ffffffffffff,%rax
  and    -0x80(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x58(%rbp)
  movabs $0x7ffffffffffff,%rax
  and    -0x60(%rbp),%rax
  mov    %rax,-0x50(%rbp)
  movabs $0x7ffffffffffff,%rax
  and    -0x58(%rbp),%rax
  mov    %rax,-0x48(%rbp)
  mov    -0x58(%rbp),%rax
  shr    $0x33,%rax
  mov    %rax,%rdx
  movabs $0x7ffffffffffff,%rax
  and    -0x78(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x40(%rbp)
  movabs $0x7ffffffffffff,%rax
  and    -0x70(%rbp),%rax
  mov    %rax,-0x38(%rbp)
  movabs $0x7ffffffffffff,%rax
  and    -0x68(%rbp),%rax
  mov    %rax,-0x30(%rbp)
  mov    -0x50(%rbp),%rax
  mov    %rax,-0x28(%rbp)
  mov    -0x48(%rbp),%rax
  mov    %rax,-0x20(%rbp)
  mov    -0x40(%rbp),%rax
  mov    %rax,-0x18(%rbp)
  mov    -0x38(%rbp),%rax
  mov    %rax,-0x10(%rbp)
  mov    -0x30(%rbp),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0xb8(%rbp),%rax
  mov    %eax,%ecx
  mov    -0x28(%rbp),%rax
  mov    $0x8,%edx
  mov    %rax,%rsi
  mov    %ecx,%edi
  call   <_br2_store@plt>
  mov    -0xb8(%rbp),%rax
  add    $0x8,%eax
  mov    %eax,%ecx
  mov    -0x20(%rbp),%rax
  mov    $0x8,%edx
  mov    %rax,%rsi
  mov    %ecx,%edi
  call   <_br2_store@plt>
  mov    -0xb8(%rbp),%rax
  add    $0x10,%eax
  mov    %eax,%ecx
  mov    -0x18(%rbp),%rax
  mov    $0x8,%edx
  mov    %rax,%rsi
  mov    %ecx,%edi
  call   <_br2_store@plt>
  mov    -0xb8(%rbp),%rax
  add    $0x18,%eax
  mov    %eax,%ecx
  mov    -0x10(%rbp),%rax
  mov    $0x8,%edx
  mov    %rax,%rsi
  mov    %ecx,%edi
  call   <_br2_store@plt>
  mov    -0xb8(%rbp),%rax
  add    $0x20,%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  mov    $0x8,%edx
  mov    %rax,%rsi
  mov    %ecx,%edi
  call   <_br2_store@plt>
  nop
  leave
  ret
```

assistant: ```c
void internal_fiat_25519_carry(uintptr_t out0, uintptr_t in0) {
  uintptr_t x0, x1, x2, x3, x4, x5, x6, x10, x11, x7, x8, x9, x12, x13, x14, x15, x16, x17, x18, x19, x20, x21;
  x0 = _br2_load((in0) + ((uintptr_t)0ULL), sizeof(uintptr_t));
  x1 = _br2_load((in0) + ((uintptr_t)8ULL), sizeof(uintptr_t));
  x2 = _br2_load((in0) + ((uintptr_t)16ULL), sizeof(uintptr_t));
  x3 = _br2_load((in0) + ((uintptr_t)24ULL), sizeof(uintptr_t));
  x4 = _br2_load((in0) + ((uintptr_t)32ULL), sizeof(uintptr_t));
  x5 = x0;
  x6 = ((x5) >> ((uintptr_t)51ULL)) + (x1);
  x7 = ((x6) >> ((uintptr_t)51ULL)) + (x2);
  x8 = ((x7) >> ((uintptr_t)51ULL)) + (x3);
  x9 = ((x8) >> ((uintptr_t)51ULL)) + (x4);
  x10 = ((x5) & ((uintptr_t)2251799813685247ULL)) + (((x9) >> ((uintptr_t)51ULL)) * ((uintptr_t)19ULL));
  x11 = ((x10) >> ((uintptr_t)51ULL)) + ((x6) & ((uintptr_t)2251799813685247ULL));
  x12 = (x10) & ((uintptr_t)2251799813685247ULL);
  x13 = (x11) & ((uintptr_t)2251799813685247ULL);
  x14 = ((x11) >> ((uintptr_t)51ULL)) + ((x7) & ((uintptr_t)2251799813685247ULL));
  x15 = (x8) & ((uintptr_t)2251799813685247ULL);
  x16 = (x9) & ((uintptr_t)2251799813685247ULL);
  x17 = x12;
  x18 = x13;
  x19 = x14;
  x20 = x15;
  x21 = x16;
  _br2_store((out0) + ((uintptr_t)0ULL), x17, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)8ULL), x18, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)16ULL), x19, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)24ULL), x20, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)32ULL), x21, sizeof(uintptr_t));
  return;
}
```