user: Please show me the C implementation that matches the assembly code listed below:

```asm
<readFile>:
  endbr64
  push   %r15
  mov    %rsi,%r15
  push   %r14
  push   %r13
  mov    $0x3,%r13d
  push   %r12
  push   %rbp
  mov    %rdi,%rbp
  push   %rbx
  sub    $0x28,%rsp
  mov    D2(%rip),%r12
  mov    %rdx,(%rsp)
  mov    %rcx,0x8(%rsp)
  mov    %r8,0x10(%rsp)
  jmp    L29
  nopl   (%rax)
L82:
  mov    %rbp,%rdi
  call   <fgetc@plt>
  mov    %eax,%r14d
  cmp    %al,(%r12)
  jne    L28
L29:
  mov    %rbp,%rdi
  call   <fgetc@plt>
  mov    %eax,%ebx
  cmp    %al,(%r12)
  jne    L82
  add    $0x28,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax,%rax,1)
L28:
  mov    %rbp,%rdi
  call   <fgetc@plt>
  mov    %eax,%ecx
  cmp    %al,(%r12)
  je     L29
  cmp    $0x2,%r13d
  je     L10
  cmp    $0x3,%r13d
  je     L18
  test   %r13d,%r13d
  je     L36
  cmp    $0x1,%r13d
  jne    L29
  movsbl %bl,%edi
  mov    %r15,%rsi
  mov    %al,0x1f(%rsp)
  xor    %r14d,%ebx
  call   <fputc@plt>
  movzbl 0x1f(%rsp),%ecx
  mov    (%rsp),%rsi
  xor    %r13d,%r13d
  xor    %ecx,%ebx
  movsbl %bl,%edi
  call   <fputc@plt>
  mov    0x8(%rsp),%rsi
  movsbl %r14b,%edi
  call   <fputc@plt>
  movsbl 0x1f(%rsp),%edi
  mov    0x10(%rsp),%rsi
  call   <fputc@plt>
  jmp    L29
  nopl   0x0(%rax)
L36:
  mov    %ebx,%edi
  mov    %r15,%rsi
  mov    %al,0x1f(%rsp)
  mov    $0x3,%r13d
  xor    %r14d,%edi
  xor    %ecx,%edi
  movsbl %dil,%edi
  call   <fputc@plt>
  mov    (%rsp),%rsi
  movsbl %bl,%edi
  call   <fputc@plt>
  mov    0x8(%rsp),%rsi
  movsbl %r14b,%edi
  call   <fputc@plt>
  movsbl 0x1f(%rsp),%edi
  mov    0x10(%rsp),%rsi
  call   <fputc@plt>
  jmp    L29
  nopl   0x0(%rax,%rax,1)
L18:
  movsbl %bl,%edi
  mov    %r15,%rsi
  mov    %al,0x1f(%rsp)
  mov    $0x2,%r13d
  call   <fputc@plt>
  mov    (%rsp),%rsi
  movsbl %r14b,%edi
  call   <fputc@plt>
  movsbl 0x1f(%rsp),%edi
  mov    0x8(%rsp),%rsi
  call   <fputc@plt>
  movzbl 0x1f(%rsp),%ecx
  mov    %ebx,%edx
  mov    0x10(%rsp),%rsi
  xor    %r14d,%edx
  xor    %ecx,%edx
  movsbl %dl,%edi
  call   <fputc@plt>
  jmp    L29
L10:
  movsbl %bl,%edi
  mov    %r15,%rsi
  mov    %al,0x1f(%rsp)
  mov    $0x1,%r13d
  call   <fputc@plt>
  mov    (%rsp),%rsi
  movsbl %r14b,%edi
  call   <fputc@plt>
  movzbl 0x1f(%rsp),%ecx
  mov    %ebx,%edx
  mov    0x8(%rsp),%rsi
  xor    %r14d,%edx
  xor    %ecx,%edx
  movsbl %dl,%edi
  call   <fputc@plt>
  movsbl 0x1f(%rsp),%edi
  mov    0x10(%rsp),%rsi
  call   <fputc@plt>
  jmp    L29
```

assistant: ```c
void readFile(FILE *f, FILE *out1, FILE *out2, FILE *out3, FILE *out4) {
  char get, save[2];
  int i = 3;
  while ((get = fgetc(f)) != EOF) {
    save[0] = get;
    if ((get = fgetc(f)) != EOF) {
      save[1] = get;
      if ((get = fgetc(f)) != EOF) {
        switch (i) {
        case 0:
          fputc((save[0] ^ save[1] ^ get), out1);
          fputc(save[0], out2);
          fputc(save[1], out3);
          fputc(get, out4);
          i = 3;
          break;
        case 1:
          fputc(save[0], out1);
          fputc((save[0] ^ save[1] ^ get), out2);
          fputc(save[1], out3);
          fputc(get, out4);
          i--;
          break;
        case 2:
          fputc(save[0], out1);
          fputc(save[1], out2);
          fputc((save[0] ^ save[1] ^ get), out3);
          fputc(get, out4);
          i--;
          break;
        case 3:
          fputc(save[0], out1);
          fputc(save[1], out2);
          fputc(get, out3);
          fputc((save[0] ^ save[1] ^ get), out4);
          i--;
        }
      }
    }
  }
}
```