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

```asm
<main>:
  endbr64
  sub    $0x8,%rsp
  xor    %edi,%edi
  call   <factorial@plt>
  lea    D120(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  mov    $0x1,%edi
  call   <factorial@plt>
  lea    D64(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  mov    $0x2,%edi
  call   <factorial@plt>
  lea    D93(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  mov    $0x3,%edi
  call   <factorial@plt>
  lea    D74(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  mov    $0x4,%edi
  call   <factorial@plt>
  lea    D32(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  mov    $0x5,%edi
  call   <factorial@plt>
  lea    D23(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  mov    $0x6,%edi
  call   <factorial@plt>
  lea    D48(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  mov    $0xa,%edi
  call   <factorial@plt>
  lea    D187(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  mov    $0x14,%edi
  call   <factorial@plt>
  lea    D89(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  mov    $0x1e,%edi
  call   <factorial@plt>
  lea    D145(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  xor    %edi,%edi
  call   <factorial_iterative@plt>
  lea    D185(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  mov    $0x1,%edi
  call   <factorial_iterative@plt>
  lea    D108(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  mov    $0x2,%edi
  call   <factorial_iterative@plt>
  lea    D47(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  mov    $0x3,%edi
  call   <factorial_iterative@plt>
  lea    D70(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  mov    $0x4,%edi
  call   <factorial_iterative@plt>
  lea    D84(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  mov    $0x5,%edi
  call   <factorial_iterative@plt>
  lea    D104(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  mov    $0x6,%edi
  call   <factorial_iterative@plt>
  lea    D35(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  mov    $0xa,%edi
  call   <factorial_iterative@plt>
  lea    D114(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  mov    $0x14,%edi
  call   <factorial_iterative@plt>
  lea    D11(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  mov    $0x1e,%edi
  call   <factorial_iterative@plt>
  lea    D49(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  xor    %eax,%eax
  add    $0x8,%rsp
  ret
```

tool_calls: name: unpack_data
arguments: label: D120
type: string
name: unpack_data
arguments: label: D64
type: string
name: unpack_data
arguments: label: D93
type: string
name: unpack_data
arguments: label: D74
type: string
name: unpack_data
arguments: label: D32
type: string
name: unpack_data
arguments: label: D23
type: string
name: unpack_data
arguments: label: D48
type: string
name: unpack_data
arguments: label: D187
type: string
name: unpack_data
arguments: label: D89
type: string
name: unpack_data
arguments: label: D145
type: string
name: unpack_data
arguments: label: D185
type: string
name: unpack_data
arguments: label: D108
type: string
name: unpack_data
arguments: label: D47
type: string
name: unpack_data
arguments: label: D70
type: string
name: unpack_data
arguments: label: D84
type: string
name: unpack_data
arguments: label: D104
type: string
name: unpack_data
arguments: label: D35
type: string
name: unpack_data
arguments: label: D114
type: string
name: unpack_data
arguments: label: D11
type: string
name: unpack_data
arguments: label: D49
type: string

tool: D120: factorial of 0 is %llu


tool: D64: factorial of 1 is %llu


tool: D93: factorial of 2 is %llu


tool: D74: factorial of 3 is %llu


tool: D32: factorial of 4 is %llu


tool: D23: factorial of 5 is %llu


tool: D48: factorial of 6 is %llu


tool: D187: factorial of 10 is %llu


tool: D89: factorial of 20 is %llu


tool: D145: factorial of 30 is %llu


tool: D185: factorial_iterative of 0 is %llu


tool: D108: factorial_iterative of 1 is %llu


tool: D47: factorial_iterative of 2 is %llu


tool: D70: factorial_iterative of 3 is %llu


tool: D84: factorial_iterative of 4 is %llu


tool: D104: factorial_iterative of 5 is %llu


tool: D35: factorial_iterative of 6 is %llu


tool: D114: factorial_iterative of 10 is %llu


tool: D11: factorial_iterative of 20 is %llu


tool: D49: factorial_iterative of 30 is %llu


assistant: ```c
int main() {
  printf("factorial of 0 is %llu\n", factorial(0));
  printf("factorial of 1 is %llu\n", factorial(1));
  printf("factorial of 2 is %llu\n", factorial(2));
  printf("factorial of 3 is %llu\n", factorial(3));
  printf("factorial of 4 is %llu\n", factorial(4));
  printf("factorial of 5 is %llu\n", factorial(5));
  printf("factorial of 6 is %llu\n", factorial(6));
  printf("factorial of 10 is %llu\n", factorial(10));
  printf("factorial of 20 is %llu\n", factorial(20));
  printf("factorial of 30 is %llu\n", factorial(30));
  printf("factorial_iterative of 0 is %llu\n", factorial_iterative(0));
  printf("factorial_iterative of 1 is %llu\n", factorial_iterative(1));
  printf("factorial_iterative of 2 is %llu\n", factorial_iterative(2));
  printf("factorial_iterative of 3 is %llu\n", factorial_iterative(3));
  printf("factorial_iterative of 4 is %llu\n", factorial_iterative(4));
  printf("factorial_iterative of 5 is %llu\n", factorial_iterative(5));
  printf("factorial_iterative of 6 is %llu\n", factorial_iterative(6));
  printf("factorial_iterative of 10 is %llu\n", factorial_iterative(10));
  printf("factorial_iterative of 20 is %llu\n", factorial_iterative(20));
  printf("factorial_iterative of 30 is %llu\n", factorial_iterative(30));
  return 0;
}
```