user: Converte this assembly snippet into its equivalent C code:

```asm
<main>:
  endbr64
  push   %r15
  xor    %eax,%eax
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x28,%rsp
  call   <__VERIFIER_nondet_ulong@plt>
  mov    %rax,%rbx
  xor    %eax,%eax
  call   <__VERIFIER_nondet_ulong@plt>
  lea    0x0(,%rbx,4),%edi
  mov    %rax,%r13
  call   <malloc@plt>
  lea    0x0(,%r13,4),%edi
  mov    %rax,%rbp
  call   <malloc@plt>
  mov    %r13,%rcx
  mov    %rbx,%rsi
  mov    %rbp,%rdi
  mov    %rax,%rdx
  mov    %rax,%r12
  call   <is_relaxed_prefix@plt>
  test   %rax,%rax
  lea    0x1(%r13),%rax
  jne    L9
  cmp    %rbx,%rax
  jb     L41
  test   %r13,%r13
  je     L196
  test   %rbx,%rbx
  je     L196
  cmp    %r13,%rbx
  mov    %r13,%rsi
  cmovbe %rbx,%rsi
  xor    %eax,%eax
  xor    %edx,%edx
  nopl   0x0(%rax)
L94:
  mov    %rax,%rcx
  sub    %rdx,%rcx
  mov    (%r12,%rcx,4),%ecx
  cmp    %ecx,0x0(%rbp,%rax,4)
  je     L29
  add    $0x1,%rdx
L29:
  add    $0x1,%rax
  cmp    %rsi,%rax
  jb     L94
L96:
  cmp    %rbx,%r13
  adc    $0x0,%rdx
  xor    %edi,%edi
  cmp    $0x1,%rdx
  seta   %dil
  call   <__VERIFIER_assert@plt>
L41:
  mov    %rbp,%rdi
  call   <free@plt>
  mov    %r12,%rdi
  call   <free@plt>
  add    $0x28,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L9:
  xor    %edi,%edi
  cmp    %rbx,%rax
  setae  %dil
  call   <__VERIFIER_assert@plt>
  xor    %eax,%eax
  call   <__VERIFIER_nondet_ulong@plt>
  mov    %rax,0x10(%rsp)
  cmp    %r13,%rbx
  ja     L135
L28:
  test   %r13,%r13
  je     L41
  test   %rbx,%rbx
  je     L41
  cmp    %r13,%rbx
  mov    0x10(%rsp),%rax
  cmovbe %rbx,%r13
  xor    %r15d,%r15d
  xor    %ecx,%ecx
  mov    %r13,0x18(%rsp)
  test   %rax,%rax
  je     L131
  cmp    %r13,%rax
  cmovbe %rax,%r13
  nopl   0x0(%rax,%rax,1)
L190:
  xor    %eax,%eax
  call   <__VERIFIER_nondet_int@plt>
  mov    %eax,0x0(%rbp,%r15,4)
  xor    %eax,%eax
  call   <__VERIFIER_nondet_int@plt>
  xor    %edi,%edi
  mov    %eax,(%r12,%r15,4)
  cmp    %eax,0x0(%rbp,%r15,4)
  sete   %dil
  call   <__VERIFIER_assume@plt>
  lea    0x1(%r15),%ecx
  add    $0x1,%r15
  cmp    %r13,%r15
  jb     L190
  cmp    0x18(%rsp),%r15
  jae    L41
L131:
  movslq %ecx,%rcx
  lea    0x1(%rcx),%rbx
  jmp    L60
  nopl   0x0(%rax,%rax,1)
L110:
  lea    0x1(%rbx),%rax
  mov    %rbx,%r15
  cmp    0x18(%rsp),%rbx
  jae    L41
  mov    %rax,%rbx
L60:
  lea    0x0(,%r15,4),%r13
  xor    %eax,%eax
  call   <__VERIFIER_nondet_int@plt>
  lea    0x0(%rbp,%r13,1),%r14
  lea    (%r12,%r13,1),%rsi
  mov    %eax,(%r14)
  xor    %eax,%eax
  mov    %rsi,0x8(%rsp)
  call   <__VERIFIER_nondet_int@plt>
  mov    0x8(%rsp),%rsi
  mov    %eax,(%rsi)
  cmp    %r15,0x10(%rsp)
  je     L149
  jae    L110
  mov    (%r14),%eax
  xor    %edi,%edi
  cmp    %eax,-0x4(%r12,%r13,1)
  sete   %dil
  call   <__VERIFIER_assert@plt>
  jmp    L110
L149:
  xor    %edi,%edi
  cmp    %eax,(%r14)
  setne  %dil
  call   <__VERIFIER_assume@plt>
  jmp    L110
L135:
  lea    -0x1(%rbx),%rax
  mov    %rax,0x10(%rsp)
  jmp    L28
L196:
  xor    %edx,%edx
  jmp    L96
```

assistant: ```c
int main() {
  unsigned long pat_len = __VERIFIER_nondet_ulong(), a_len = __VERIFIER_nondet_ulong();
  int *pat = malloc(sizeof(int) * pat_len);
  int *a = malloc(sizeof(int) * a_len);
  if (is_relaxed_prefix(pat, pat_len, a, a_len)) {
    __VERIFIER_assert(pat_len <= a_len + 1);
    unsigned long different = __VERIFIER_nondet_ulong();
    if (pat_len > a_len)
      different = pat_len - 1;
    for (int i = 0; i < pat_len && i < a_len; i++) {
      pat[i] = __VERIFIER_nondet_int();
      a[i] = __VERIFIER_nondet_int();
      if (i < different)
        __VERIFIER_assume(pat[i] == a[i]);
      else if (i == different)
        __VERIFIER_assume(pat[i] != a[i]);
      else if (i > different)
        __VERIFIER_assert(pat[i] == a[i - 1]);
    }
  } else if (pat_len <= a_len + 1) {
    unsigned long differences = 0;
    for (int i = 0; i < pat_len && i < a_len; i++) {
      if (pat[i] != a[i - differences])
        ++differences;
    }
    if (pat_len > a_len)
      ++differences;
    __VERIFIER_assert(differences > 1);
  }
  free(pat);
  free(a);
  return 0;
}
```