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

```asm
<multiply>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  lea    -0x4000(%rsp),%r11
L184:
  sub    $0x1000,%rsp
  orq    $0x0,(%rsp)
  cmp    %r11,%rsp
  jne    L184
  sub    $0xe48,%rsp
  mov    %rdi,%r14
  mov    %rdi,(%rsp)
  mov    %rsi,%r12
  mov    %fs:0x28,%rax
  mov    %rax,0x4e38(%rsp)
  xor    %eax,%eax
  call   <strlen@plt>
  mov    %eax,%ebp
  lea    -0x1(%rax),%ebx
  mov    %r12,%rdi
  call   <strlen@plt>
  mov    %eax,%r15d
  lea    -0x1(%rax),%eax
  mov    %eax,0xc(%rsp)
  test   %ebx,%ebx
  js     L223
  mov    %r14,%rax
  lea    -0x1(%rbp),%edx
  lea    0x1(%r14,%rdx,1),%rdx
L125:
  subb   $0x30,(%rax)
  add    $0x1,%rax
  cmp    %rdx,%rax
  jne    L125
L223:
  cmpl   $0x0,0xc(%rsp)
  js     L174
  lea    -0x1(%r15),%eax
  lea    0x1(%r12,%rax,1),%rdx
  mov    %r12,%rax
L54:
  subb   $0x30,(%rax)
  add    $0x1,%rax
  cmp    %rdx,%rax
  jne    L54
  movslq 0xc(%rsp),%r13
  add    %r12,%r13
  mov    $0x0,%r14d
  mov    $0x0,%r11d
  movslq %ebp,%rax
  mov    (%rsp),%rdi
  lea    -0x2(%rdi,%rax,1),%r9
  lea    -0x1(%rbp),%eax
  sub    %rax,%r9
  movabs $0x6666666666666667,%r10
  movslq %r15d,%rax
  lea    -0x1(%r12,%rax,1),%r12
  jmp    L177
L172:
  movsbl 0x0(%r13),%r8d
  movslq %ebx,%rsi
  add    (%rsp),%rsi
  movslq %r11d,%rax
  lea    0x2720(%rsp,%rax,1),%rdi
  mov    $0x0,%edx
L188:
  movsbl (%rsi),%ecx
  imul   %r8d,%ecx
  movslq %ecx,%rcx
  add    %rdx,%rcx
  mov    %rcx,%rax
  imul   %r10
  sar    $0x2,%rdx
  mov    %rcx,%rax
  sar    $0x3f,%rax
  sub    %rax,%rdx
  lea    (%rdx,%rdx,4),%rax
  add    %rax,%rax
  sub    %rax,%rcx
  mov    %cl,(%rdi)
  sub    $0x1,%rsi
  add    $0x1,%rdi
  cmp    %r9,%rsi
  jne    L188
  add    %ebp,%r11d
L238:
  lea    0x1(%r11),%esi
  movslq %r11d,%rax
  mov    %dl,0x2720(%rsp,%rax,1)
  lea    0x1(%r14),%ecx
  test   %ecx,%ecx
  jle    L51
  mov    %rax,%rsi
  lea    0x2720(%rsp,%rax,1),%rax
  mov    %r12,%rdx
  sub    %r13,%rdx
  lea    0x2721(%rsp,%rdx,1),%rdx
  add    %rsi,%rdx
L41:
  movb   $0x0,0x1(%rax)
  add    $0x1,%rax
  cmp    %rdx,%rax
  jne    L41
  lea    0x2(%r11,%r14,1),%r11d
L113:
  sub    $0x1,%r13
  cmp    %ecx,%r15d
  je     L174
  mov    %ecx,%r14d
L177:
  mov    $0x0,%edx
  test   %ebx,%ebx
  jns    L172
  jmp    L238
L51:
  mov    %esi,%r11d
  jmp    L113
L174:
  add    0xc(%rsp),%ebx
  mov    %ebx,%eax
  add    $0x1,%eax
  js     L97
  lea    0x1(%rbx),%r10d
  mov    $0x0,%r8d
  mov    $0x0,%edx
  lea    (%r15,%rbp,1),%r9d
  movabs $0x6666666666666667,%r11
  jmp    L134
L141:
  add    $0x1,%ecx
  add    %ecx,%esi
  cmp    %r9d,%ecx
  je     L229
L5:
  cmp    %r8d,%ecx
  jl     L141
  lea    (%r12,%rsi,1),%edi
  movslq %edi,%rdi
  movsbq 0x2720(%rsp,%rdi,1),%rdi
  add    %rdi,%rax
  jmp    L141
L229:
  lea    (%rdx,%rax,1),%rcx
  mov    %rcx,%rax
  imul   %r11
  sar    $0x2,%rdx
  mov    %rcx,%rax
  sar    $0x3f,%rax
  sub    %rax,%rdx
  lea    (%rdx,%rdx,4),%rsi
  add    %rsi,%rsi
  mov    %rcx,%rax
  sub    %rsi,%rax
  mov    %al,0x10(%rsp,%r8,1)
  lea    0x1(%r8),%rax
  cmp    %r10,%r8
  je     L72
  mov    %rax,%r8
L134:
  mov    %r8d,%r12d
  mov    %ebp,%ecx
  mov    $0x0,%eax
  mov    $0x0,%esi
  test   %r15d,%r15d
  jg     L5
  jmp    L229
L72:
  lea    0x2(%rbx),%eax
  cltq
  mov    %dl,0x10(%rsp,%rax,1)
  movslq %ebx,%rax
  lea    0x10(%rsp,%rax,1),%rcx
  lea    D17(%rip),%rax
  lea    0x1(%rax),%rsi
  add    %r10,%rsi
L210:
  movzbl 0x1(%rcx),%edi
  lea    0x30(%rdi),%edx
  mov    %dl,(%rax)
  sub    $0x1,%rcx
  add    $0x1,%rax
  cmp    %rax,%rsi
  jne    L210
  add    $0x2,%ebx
L201:
  lea    D17(%rip),%rdx
  movslq %ebx,%rax
  movb   $0x0,(%rdx,%rax,1)
  mov    0x4e38(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L61
  mov    %rdx,%rax
  add    $0x4e48,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L97:
  mov    $0x0,%ebx
  jmp    L201
L61:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
char *multiply(char a[], char b[]) {
  static char mul[10000];
  char c[10000];
  char temp[10000];
  int la, lb;
  int i, j, k = 0, x = 0, y;
  long int r = 0;
  long sum = 0;
  la = strlen(a) - 1;
  lb = strlen(b) - 1;
  for (i = 0; i <= la; i++) {
    a[i] = a[i] - 48;
  }
  for (i = 0; i <= lb; i++) {
    b[i] = b[i] - 48;
  }
  for (i = lb; i >= 0; i--) {
    r = 0;
    for (j = la; j >= 0; j--) {
      temp[k++] = (b[i] * a[j] + r) % 10;
      r = (b[i] * a[j] + r) / 10;
    }
    temp[k++] = r;
    x++;
    for (y = 0; y < x; y++) {
      temp[k++] = 0;
    }
  }
  k = 0;
  r = 0;
  for (i = 0; i < la + lb + 2; i++) {
    sum = 0;
    y = 0;
    for (j = 1; j <= lb + 1; j++) {
      if (i <= la + j) {
        sum = sum + temp[y + i];
      }
      y += j + la + 1;
    }
    c[k++] = (sum + r) % 10;
    r = (sum + r) / 10;
  }
  c[k] = r;
  j = 0;
  for (i = k - 1; i >= 0; i--) {
    mul[j++] = c[i] + 48;
  }
  mul[j] = '\0';
  return mul;
}
```