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

```asm
<main>:
  endbr64
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x90,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x88(%rsp)
  xor    %eax,%eax
  lea    0xc(%rsp),%rdi
  call   <pipe@plt>
  cmp    $0xffffffff,%eax
  je     L96
L69:
  lea    0x14(%rsp),%rdi
  call   <pipe@plt>
  cmp    $0xffffffff,%eax
  je     L23
L148:
  lea    0x1c(%rsp),%rdi
  call   <pipe@plt>
  cmp    $0xffffffff,%eax
  je     L47
L157:
  call   <fork@plt>
  mov    %eax,0x24(%rsp)
  test   %eax,%eax
  je     L46
L73:
  call   <fork@plt>
  mov    %eax,%ebx
  mov    %eax,0x28(%rsp)
  test   %eax,%eax
  je     L14
L71:
  call   <fork@plt>
  mov    %eax,0x2c(%rsp)
  test   %eax,%eax
  je     L198
L25:
  mov    0xc(%rsp),%edi
  call   <close@plt>
  mov    0x14(%rsp),%edi
  call   <close@plt>
  mov    0x1c(%rsp),%edi
  call   <close@plt>
  mov    0x10(%rsp),%edi
  call   <close@plt>
  mov    0x18(%rsp),%edi
  call   <close@plt>
  mov    0x20(%rsp),%edi
  call   <close@plt>
  mov    $0x1,%ebx
  lea    D53(%rip),%r12
L80:
  mov    0x20(%rsp,%rbx,4),%ebp
  lea    0x8(%rsp),%rsi
  mov    $0x0,%edx
  mov    %ebp,%edi
  call   <waitpid@plt>
  mov    %ebp,%edx
  mov    %ebx,%esi
  mov    %r12,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  add    $0x1,%rbx
  cmp    $0x4,%rbx
  jne    L80
  mov    0x88(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L160
  mov    $0x0,%eax
  add    $0x90,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  ret
L96:
  lea    D17(%rip),%rdi
  call   <perror@plt>
  mov    $0x1,%edi
  call   <exit@plt>
  jmp    L69
L23:
  lea    D94(%rip),%rdi
  call   <perror@plt>
  mov    $0x1,%edi
  call   <exit@plt>
  jmp    L148
L47:
  lea    D120(%rip),%rdi
  call   <perror@plt>
  mov    $0x1,%edi
  call   <exit@plt>
  jmp    L157
L46:
  call   <getpid@plt>
  mov    %eax,%esi
  lea    D117(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  lea    0x30(%rsp),%rbx
  mov    %rbx,%rsi
  lea    D66(%rip),%rdi
  call   <scanf@plt>
  mov    $0x14,%edx
  mov    %rbx,%rsi
  mov    0x10(%rsp),%edi
  call   <write@plt>
  lea    0x50(%rsp),%rbx
  mov    $0x14,%edx
  mov    %rbx,%rsi
  mov    0x1c(%rsp),%edi
  call   <read@plt>
  mov    $0x0,%eax
  call   <getpid@plt>
  mov    %eax,%esi
  mov    %rbx,%rdx
  lea    D44(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  lea    0x70(%rsp),%rsi
  mov    $0x1,%edx
  mov    0x10(%rsp),%edi
  call   <write@plt>
  mov    0xc(%rsp),%edi
  call   <close@plt>
  mov    0x14(%rsp),%edi
  call   <close@plt>
  mov    0x1c(%rsp),%edi
  call   <close@plt>
  mov    0x10(%rsp),%edi
  call   <close@plt>
  mov    0x18(%rsp),%edi
  call   <close@plt>
  mov    0x20(%rsp),%edi
  call   <close@plt>
  mov    $0x0,%edi
  call   <exit@plt>
  jmp    L73
L14:
  lea    0x30(%rsp),%rbp
  mov    $0x14,%edx
  mov    %rbp,%rsi
  mov    0xc(%rsp),%edi
  call   <read@plt>
  mov    $0x0,%eax
  call   <getpid@plt>
  mov    %eax,%esi
  lea    D22(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    %rbp,%rsi
  lea    D113(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  cmpb   $0x0,0x30(%rsp)
  je     L138
  lea    0x31(%rsp),%rax
L132:
  mov    %ebx,%ecx
  add    $0x1,%ebx
  add    $0x1,%rax
  cmpb   $0x0,-0x1(%rax)
  jne    L132
  movslq %ebx,%rbx
  movb   $0x0,0x50(%rsp,%rbx,1)
  test   %ecx,%ecx
  js     L112
  lea    0x30(%rsp),%rax
  movslq %ecx,%rdx
  lea    0x50(%rsp,%rdx,1),%rdx
  mov    %ecx,%ecx
  lea    0x31(%rsp,%rcx,1),%rsi
L178:
  movzbl (%rax),%ecx
  mov    %cl,(%rdx)
  add    $0x1,%rax
  sub    $0x1,%rdx
  cmp    %rsi,%rax
  jne    L178
L112:
  lea    0x50(%rsp),%rbx
  mov    %rbx,%rsi
  lea    D79(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    $0x14,%edx
  mov    %rbx,%rsi
  mov    0x18(%rsp),%edi
  call   <write@plt>
  lea    0x70(%rsp),%rbx
  mov    $0x1,%edx
  mov    %rbx,%rsi
  mov    0xc(%rsp),%edi
  call   <read@plt>
  mov    $0x1,%edx
  mov    %rbx,%rsi
  mov    0x18(%rsp),%edi
  call   <write@plt>
  mov    0xc(%rsp),%edi
  call   <close@plt>
  mov    0x14(%rsp),%edi
  call   <close@plt>
  mov    0x1c(%rsp),%edi
  call   <close@plt>
  mov    0x10(%rsp),%edi
  call   <close@plt>
  mov    0x18(%rsp),%edi
  call   <close@plt>
  mov    0x20(%rsp),%edi
  call   <close@plt>
  mov    $0x0,%edi
  call   <exit@plt>
  jmp    L71
L198:
  lea    0x50(%rsp),%rbx
  mov    $0x14,%edx
  mov    %rbx,%rsi
  mov    0x14(%rsp),%edi
  call   <read@plt>
  mov    $0x0,%eax
  call   <getpid@plt>
  mov    %eax,%esi
  lea    D54(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    %rbx,%rsi
  lea    D113(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  movzbl 0x50(%rsp),%eax
  test   %al,%al
  je     L51
  mov    %rbx,%rdx
L95:
  sub    $0x20,%eax
  mov    %al,(%rdx)
  add    $0x1,%rdx
  movzbl (%rdx),%eax
  test   %al,%al
  jne    L95
L51:
  lea    0x50(%rsp),%rbx
  mov    %rbx,%rsi
  lea    D42(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    $0x14,%edx
  mov    %rbx,%rsi
  mov    0x20(%rsp),%edi
  call   <write@plt>
  lea    0x70(%rsp),%rsi
  mov    $0x1,%edx
  mov    0x14(%rsp),%edi
  call   <read@plt>
  mov    0xc(%rsp),%edi
  call   <close@plt>
  mov    0x14(%rsp),%edi
  call   <close@plt>
  mov    0x1c(%rsp),%edi
  call   <close@plt>
  mov    0x10(%rsp),%edi
  call   <close@plt>
  mov    0x18(%rsp),%edi
  call   <close@plt>
  mov    0x20(%rsp),%edi
  call   <close@plt>
  mov    $0x0,%edi
  call   <exit@plt>
  jmp    L25
L138:
  movb   $0x0,0x50(%rsp)
  jmp    L112
L160:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: parse_data
arguments: tag: D53
datatype: string
name: parse_data
arguments: tag: D17
datatype: string
name: parse_data
arguments: tag: D94
datatype: string
name: parse_data
arguments: tag: D120
datatype: string
name: parse_data
arguments: tag: D117
datatype: string
name: parse_data
arguments: tag: D66
datatype: string
name: parse_data
arguments: tag: D44
datatype: string
name: parse_data
arguments: tag: D22
datatype: string
name: parse_data
arguments: tag: D113
datatype: string
name: parse_data
arguments: tag: D79
datatype: string
name: parse_data
arguments: tag: D54
datatype: string
name: parse_data
arguments: tag: D42
datatype: string

tool: D53: I am Process %d
My Pid is %d
I am about to die


tool: D17: pipe1 fail

tool: D94: pipe2 fail

tool: D120: pipe3 fail

tool: D117: I am Process P1 
My Pid is %ld 
Please enter a string: 

tool: D66: %s

tool: D44: I am Process P1 
My Pid is %ld 
I just received uppercase %s


tool: D22: I am Process P2 
My Pid is %ld 


tool: D113: I just received the string %s


tool: D79: I am sending %s to P3


tool: D54: I am Process P3 
My Pid is %ld 


tool: D42: I am sending uppercase %s back to P1 


assistant: ```c
int main() {
  pid_t pid[3];
  int atob[2], btoc[2], ctoa[2], n;
  if (pipe(atob) == -1) {
    perror("pipe1 fail");
    exit(1);
  }
  if (pipe(btoc) == -1) {
    perror("pipe2 fail");
    exit(1);
  }
  if (pipe(ctoa) == -1) {
    perror("pipe3 fail");
    exit(1);
  }
  pid[0] = fork();
  if (pid[0] == 0) {
    char str1[20], str2[20], dummy[20];
    printf("I am Process P1 \nMy Pid is %ld \nPlease enter a string: ", getpid());
    scanf("%s", &str1);
    write(atob[1], str1, 20);
    read(ctoa[0], str2, 20);
    printf("I am Process P1 \nMy Pid is %ld \nI just received uppercase %s\n", getpid(), str2);
    write(atob[1], dummy, 1);
    for (n = 0; n != 2; n++) {
      close(atob[n]);
      close(btoc[n]);
      close(ctoa[n]);
    }
    exit(0);
  }
  pid[1] = fork();
  if (pid[1] == 0) {
    char str2[20], str3[20], dummy[20];
    int i, c, a;
    read(atob[0], str2, 20);
    printf("I am Process P2 \nMy Pid is %ld \n", getpid());
    printf("I just received the string %s\n", str2);
    for (i = 0; str2[i] != '\0'; i++)
      ;
    str3[i] = '\0';
    a = 0;
    for (c = i - 1; c >= 0; c--) {
      str3[c] = str2[a];
      a++;
    }
    printf("I am sending %s to P3\n", str3);
    write(btoc[1], str3, 20);
    read(atob[0], dummy, 1);
    write(btoc[1], dummy, 1);
    for (n = 0; n != 2; n++) {
      close(atob[n]);
      close(btoc[n]);
      close(ctoa[n]);
    }
    exit(0);
  }
  pid[2] = fork();
  if (pid[2] == 0) {
    char str3[20], dummy[20];
    int i;
    read(btoc[0], str3, 20);
    printf("I am Process P3 \nMy Pid is %ld \n", getpid());
    printf("I just received the string %s\n", str3);
    for (i = 0; str3[i] != '\0'; i++) {
      str3[i] = str3[i] - 32;
    }
    printf("I am sending uppercase %s back to P1 \n", str3);
    write(ctoa[1], str3, 20);
    read(btoc[0], dummy, 1);
    for (n = 0; n != 2; n++) {
      close(atob[n]);
      close(btoc[n]);
      close(ctoa[n]);
    }
    exit(0);
  }
  for (n = 0; n != 2; n++) {
    close(atob[n]);
    close(btoc[n]);
    close(ctoa[n]);
  }
  for (n = 0; n < 3; n++) {
    int status;
    waitpid(pid[n], &status, 0);
    printf("I am Process %d\nMy Pid is %d\nI am about to die\n", n + 1, pid[n]);
  }
}
```