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

```asm
<main>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x40,%rsp
  lea    D8(%rip),%rax
  mov    %rax,%rsi
  lea    D42(%rip),%rax
  mov    %rax,%rdi
  call   <fopen@plt>
  mov    %rax,-0x28(%rbp)
  lea    D31(%rip),%rax
  mov    %rax,%rsi
  lea    D28(%rip),%rax
  mov    %rax,%rdi
  call   <fopen@plt>
  mov    %rax,-0x20(%rbp)
  mov    $0x1a,%edi
  call   <malloc@plt>
  mov    %rax,-0x18(%rbp)
  mov    $0x1a,%edi
  call   <malloc@plt>
  mov    %rax,-0x10(%rbp)
  mov    $0x1a,%edi
  call   <malloc@plt>
  mov    %rax,-0x8(%rbp)
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <fgetc@plt>
  mov    %al,-0x3d(%rbp)
  movl   $0x0,-0x34(%rbp)
  mov    -0x18(%rbp),%rax
  mov    $0x1a,%esi
  mov    %rax,%rdi
  call   <zeroStr@plt>
  mov    -0x10(%rbp),%rax
  mov    $0x1a,%esi
  mov    %rax,%rdi
  call   <zeroStr@plt>
  mov    -0x8(%rbp),%rax
  mov    $0x1a,%esi
  mov    %rax,%rdi
  call   <zeroStr@plt>
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  mov    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  mov    -0x8(%rbp),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  movl   $0x0,-0x3c(%rbp)
  jmp    L69
L89:
  movsbl -0x3d(%rbp),%eax
  mov    -0x18(%rbp),%rcx
  mov    $0x1a,%edx
  mov    %rcx,%rsi
  mov    %eax,%edi
  call   <charExists@plt>
  test   %rax,%rax
  jne    L78
  movl   $0x0,-0x38(%rbp)
  jmp    L85
L53:
  addl   $0x1,-0x38(%rbp)
L85:
  mov    -0x38(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x30,%al
  jne    L53
  mov    -0x38(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rax,%rdx
  movzbl -0x3d(%rbp),%eax
  mov    %al,(%rdx)
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <fgetc@plt>
  mov    %eax,-0x2c(%rbp)
  mov    -0x38(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  mov    -0x2c(%rbp),%edx
  mov    %dl,(%rax)
  mov    -0x2c(%rbp),%eax
  mov    %al,-0x3d(%rbp)
  jmp    L46
L78:
  movsbl -0x3d(%rbp),%eax
  mov    -0x18(%rbp),%rdx
  mov    %rdx,%rsi
  mov    %eax,%edi
  call   <charLoc@plt>
  mov    %eax,-0x30(%rbp)
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <fgetc@plt>
  mov    %eax,-0x2c(%rbp)
  mov    -0x30(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  mov    -0x2c(%rbp),%edx
  mov    %dl,(%rax)
  mov    -0x2c(%rbp),%eax
  mov    %al,-0x3d(%rbp)
L46:
  addl   $0x1,-0x3c(%rbp)
L69:
  cmpl   $0x32,-0x3c(%rbp)
  jle    L89
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  mov    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  mov    -0x8(%rbp),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  movl   $0x0,-0x38(%rbp)
  jmp    L18
L45:
  mov    -0x38(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%edx
  mov    -0x38(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x8(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  cmp    %al,%dl
  jne    L54
  addl   $0x1,-0x34(%rbp)
L54:
  addl   $0x1,-0x38(%rbp)
L18:
  cmpl   $0x19,-0x38(%rbp)
  jle    L45
  mov    -0x34(%rbp),%eax
  mov    %eax,%esi
  lea    D29(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    -0x34(%rbp),%edx
  mov    -0x20(%rbp),%rax
  lea    D52(%rip),%rcx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <fprintf@plt>
  mov    $0x0,%eax
  leave
  ret
```

tool_calls: name: unpack_data
arguments: data_tag: D8
datatype: string
name: unpack_data
arguments: data_tag: D42
datatype: string
name: unpack_data
arguments: data_tag: D31
datatype: string
name: unpack_data
arguments: data_tag: D28
datatype: string
name: unpack_data
arguments: data_tag: D29
datatype: string
name: unpack_data
arguments: data_tag: D52
datatype: string

tool: D8: r

tool: D42: circlecross.in

tool: D31: w

tool: D28: circlecross.out

tool: D29: Crossing Pairs: %d


tool: D52: %d


assistant: ```c
int main(void) {
  FILE *fl = fopen("circlecross.in", "r");
  FILE *fout = fopen("circlecross.out", "w");
  char *cows = malloc(sizeof(char) * 26);
  char *entryPair = malloc(sizeof(char) * 26);
  char *exitPair = malloc(sizeof(char) * 26);
  int i;
  char cow = fgetc(fl);
  int pos;
  int cowLoc;
  int pair;
  int pairs = 0;
  zeroStr(cows, 26);
  zeroStr(entryPair, 26);
  zeroStr(exitPair, 26);
  printf("%s\n", cows);
  printf("%s\n", entryPair);
  printf("%s\n", exitPair);
  for (i = 0; i < 51; i++) {
    if (charExists(cow, cows, 26) == 0) {
      pos = 0;
      while (*(cows + pos) != '0') {
        pos++;
      }
      *(cows + pos) = cow;
      pair = fgetc(fl);
      *(entryPair + pos) = pair;
      cow = pair;
    } else {
      cowLoc = charLoc(cow, cows);
      pair = fgetc(fl);
      *(exitPair + cowLoc) = pair;
      cow = pair;
    }
  }
  printf("%s\n", cows);
  printf("%s\n", entryPair);
  printf("%s\n", exitPair);
  pos = 0;
  while (pos < 26) {
    if (*(entryPair + pos) == *(exitPair + pos)) {
      pairs++;
    }
    pos++;
  }
  printf("Crossing Pairs: %d\n", pairs);
  fprintf(fout, "%d\n", pairs);
}
```