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

```asm
<main>:
  endbr64
  push   %r15
  mov    $0x33,%ecx
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  lea    D28(%rip),%rbp
  push   %rbx
  sub    $0x1e8,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x1d8(%rsp)
  xor    %eax,%eax
  lea    0x20(%rsp),%r14
  lea    0x40(%rsp),%rdi
  mov    %r14,%rsi
  mov    %r14,%rbx
  rep stos %rax,%es:(%rdi)
  lea    0x10(%rsp),%rdi
  mov    %rdi,0x8(%rsp)
  call   <initialize_test_vectors@plt>
  lea    D18(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  lea    0x40(%rsp),%rax
  mov    %rax,(%rsp)
  nopl   (%rax)
L33:
  mov    (%rbx),%esi
  mov    %rbp,%rdi
  xor    %eax,%eax
  add    $0x4,%rbx
  call   <printf@plt>
  cmp    (%rsp),%rbx
  jne    L33
  mov    (%rsp),%rbx
  mov    %r14,%rsi
  xor    %r12d,%r12d
  lea    D15(%rip),%r13
  mov    %rbx,%rdi
  call   <key_schedule@plt>
  nop
L0:
  mov    %r12d,%esi
  mov    %r13,%rdi
  xor    %eax,%eax
  xor    %r15d,%r15d
  call   <printf@plt>
L54:
  mov    (%rbx,%r15,4),%esi
  mov    %rbp,%rdi
  xor    %eax,%eax
  add    $0x1,%r15
  call   <printf@plt>
  cmp    $0x6,%r15
  jne    L54
  add    $0x1,%r12d
  add    $0x18,%rbx
  cmp    $0x11,%r12d
  jne    L0
  lea    D47(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    0x8(%rsp),%r12
  mov    %r12,%rbx
L52:
  mov    (%r12),%esi
  mov    %rbp,%rdi
  xor    %eax,%eax
  add    $0x4,%r12
  call   <printf@plt>
  cmp    %r12,%r14
  jne    L52
  mov    0x8(%rsp),%r12
  mov    (%rsp),%rsi
  mov    %r12,%rdi
  call   <sparx_encrypt@plt>
  lea    D35(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
L38:
  mov    (%r12),%esi
  mov    %rbp,%rdi
  xor    %eax,%eax
  add    $0x4,%r12
  call   <printf@plt>
  cmp    %r14,%r12
  jne    L38
  mov    0x8(%rsp),%r15
  xor    %esi,%esi
  mov    %r15,%rdi
  call   <check_test_vectors@plt>
  mov    (%rsp),%rsi
  mov    %r15,%rdi
  call   <sparx_decrypt@plt>
  lea    D46(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
L49:
  mov    (%rbx),%esi
  mov    %rbp,%rdi
  xor    %eax,%eax
  add    $0x4,%rbx
  call   <printf@plt>
  cmp    %rbx,%r14
  jne    L49
  mov    0x8(%rsp),%rdi
  mov    $0x1,%esi
  call   <check_test_vectors@plt>
  mov    $0xa,%edi
  call   <putchar@plt>
  mov    0x1d8(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L24
  add    $0x1e8,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L24:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: read_data
arguments: tag: D28
type: string
name: read_data
arguments: tag: D18
type: string
name: read_data
arguments: tag: D15
type: string
name: read_data
arguments: tag: D47
type: string
name: read_data
arguments: tag: D35
type: string
name: read_data
arguments: tag: D46
type: string

tool: D28: %04x 

tool: D18: master = 

tool: D15: 
k^{%2d} = 

tool: D47: 

plaintext  = 

tool: D35: 
ciphertext = 

tool: D46: 
decryption = 

assistant: ```c
int main() {
  uint16_t x[2 * 2], master_key[2 * 4], k[2 * 8 + 1][2 * 3] = {{0}};
  uint8_t i, j;
  initialize_test_vectors(x, master_key);
  printf("master = ");
  for (i = 0; i < 2 * 4; i++) {
    printf("%04x ", master_key[i]);
  }
  key_schedule(k, master_key);
  for (i = 0; i < 2 * 8 + 1; i++) {
    printf("\nk^{%2d} = ", i);
    for (j = 0; j < 2 * 3; j++)
      printf("%04x ", k[i][j]);
  }
  printf("\n\nplaintext  = ");
  for (i = 0; i < 2 * 2; i++) {
    printf("%04x ", x[i]);
  }
  sparx_encrypt(x, k);
  printf("\nciphertext = ");
  for (i = 0; i < 2 * 2; i++) {
    printf("%04x ", x[i]);
  }
  check_test_vectors(x, 0);
  sparx_decrypt(x, k);
  printf("\ndecryption = ");
  for (i = 0; i < 2 * 2; i++) {
    printf("%04x ", x[i]);
  }
  check_test_vectors(x, 1);
  printf("\n");
  return 0;
}
```