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

```asm
<output_vcf_row>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x48,%rsp
  mov    %r8,0x8(%rsp)
  mov    %fs:0x28,%rax
  mov    %rax,0x38(%rsp)
  xor    %eax,%eax
  movzbl (%rsi),%r12d
  test   %r12b,%r12b
  jne    L21
L20:
  mov    0x38(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L26
  add    $0x48,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L21:
  mov    %rdi,%rbx
  mov    %rsi,%rbp
  mov    %edx,%r14d
  mov    %ecx,%r13d
  mov    %r9d,%r15d
  mov    %rdi,%rcx
  mov    $0x2,%edx
  mov    $0x1,%esi
  lea    D36(%rip),%rdi
  call   <fwrite@plt>
  lea    (%r14,%r15,1),%edx
  lea    D46(%rip),%rsi
  mov    %rbx,%rdi
  mov    $0x0,%eax
  call   <fprintf@plt>
  mov    %rbx,%rcx
  mov    $0x2,%edx
  mov    $0x1,%esi
  lea    D22(%rip),%r14
  mov    %r14,%rdi
  call   <fwrite@plt>
  movsbl %r12b,%r12d
  mov    %r12d,%edx
  lea    D57(%rip),%rsi
  mov    %rbx,%rdi
  mov    $0x0,%eax
  call   <fprintf@plt>
  lea    0x10(%rsp),%r15
  mov    %r13d,%ecx
  mov    %r15,%rdx
  mov    %rbp,%rsi
  mov    %r12d,%edi
  call   <alternative_bases@plt>
  mov    %r15,%rdx
  lea    D12(%rip),%rsi
  mov    %rbx,%rdi
  mov    $0x0,%eax
  call   <fprintf@plt>
  mov    %rbx,%rcx
  mov    $0x2,%edx
  mov    $0x1,%esi
  mov    %r14,%rdi
  call   <fwrite@plt>
  mov    %rbx,%rcx
  mov    $0x2,%edx
  mov    $0x1,%esi
  mov    %r14,%rdi
  call   <fwrite@plt>
  mov    %rbx,%rcx
  mov    $0x2,%edx
  mov    $0x1,%esi
  mov    %r14,%rdi
  call   <fwrite@plt>
  mov    %rbx,%rcx
  mov    $0x3,%edx
  mov    $0x1,%esi
  lea    D14(%rip),%rdi
  call   <fwrite@plt>
  mov    0x8(%rsp),%r8
  mov    %r13d,%ecx
  mov    %rbp,%rdx
  mov    %r12d,%esi
  mov    %rbx,%rdi
  call   <output_vcf_row_samples_bases@plt>
  mov    %rbx,%rsi
  mov    $0xa,%edi
  call   <fputc@plt>
  jmp    L20
L26:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: read_data
arguments: data_label: D36
type_infered: string
name: read_data
arguments: data_label: D46
type_infered: string
name: read_data
arguments: data_label: D22
type_infered: string
name: read_data
arguments: data_label: D57
type_infered: string
name: read_data
arguments: data_label: D12
type_infered: string
name: read_data
arguments: data_label: D14
type_infered: string

tool: D36: 1	

tool: D46: %d	

tool: D22: .	

tool: D57: %c	

tool: D12: %s	

tool: D14: AB	

assistant: ```c
void output_vcf_row(FILE *vcf_file_pointer, char *bases_for_snp, int snp_location, int number_of_samples, int internal_nodes[], int offset) {
  char reference_base = bases_for_snp[0];
  char alt_bases[30];
  if (reference_base == '\0') {
    return;
  }
  fprintf(vcf_file_pointer, "1\t");
  fprintf(vcf_file_pointer, "%d\t", (int)snp_location + offset);
  fprintf(vcf_file_pointer, ".\t");
  fprintf(vcf_file_pointer, "%c\t", (char)reference_base);
  alternative_bases(reference_base, bases_for_snp, alt_bases, number_of_samples);
  fprintf(vcf_file_pointer, "%s\t", alt_bases);
  fprintf(vcf_file_pointer, ".\t");
  fprintf(vcf_file_pointer, ".\t");
  fprintf(vcf_file_pointer, ".\t");
  fprintf(vcf_file_pointer, "AB\t");
  output_vcf_row_samples_bases(vcf_file_pointer, reference_base, bases_for_snp, number_of_samples, internal_nodes);
  fprintf(vcf_file_pointer, "\n");
}
```