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

```asm
<main>:
  endbr64
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x20,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x18(%rsp)
  xor    %eax,%eax
  lea    0xe(%rsp),%rcx
  lea    0x14(%rsp),%rdx
  lea    0x10(%rsp),%rsi
  lea    D31(%rip),%rdi
  call   <scanf@plt>
  mov    0x10(%rsp),%eax
  lea    0x0(,%rax,4),%edi
  call   <malloc@plt>
  mov    %rax,%r12
  mov    0x14(%rsp),%eax
  lea    0x0(,%rax,4),%edi
  call   <malloc@plt>
  mov    %rax,%rbp
  lea    D14(%rip),%rdi
  mov    $0x0,%eax
  call   <scanf@plt>
  mov    0x10(%rsp),%ebx
  sub    $0x1,%ebx
  js     L33
  movslq %ebx,%rbx
  lea    D12(%rip),%r14
L106:
  lea    0xf(%rsp),%rsi
  mov    %r14,%rdi
  mov    $0x0,%eax
  call   <scanf@plt>
  movsbl 0xf(%rsp),%eax
  sub    $0x30,%eax
  mov    %eax,(%r12,%rbx,4)
  sub    $0x1,%rbx
  test   %ebx,%ebx
  jns    L106
L33:
  lea    D14(%rip),%rdi
  mov    $0x0,%eax
  call   <scanf@plt>
  mov    0x14(%rsp),%ebx
  sub    $0x1,%ebx
  js     L17
  movslq %ebx,%rbx
  lea    D12(%rip),%r14
L127:
  lea    0xf(%rsp),%rsi
  mov    %r14,%rdi
  mov    $0x0,%eax
  call   <scanf@plt>
  movsbl 0xf(%rsp),%eax
  sub    $0x30,%eax
  mov    %eax,0x0(%rbp,%rbx,4)
  sub    $0x1,%rbx
  test   %ebx,%ebx
  jns    L127
L17:
  movzbl 0xe(%rsp),%eax
  cmp    $0x4d,%al
  je     L25
  cmp    $0x53,%al
  je     L53
  cmp    $0x41,%al
  je     L64
L132:
  mov    %r12,%rdi
  call   <free@plt>
  mov    %rbp,%rdi
  call   <free@plt>
  mov    %r13,%rdi
  call   <free@plt>
  mov    0x18(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L105
  mov    $0x0,%eax
  add    $0x20,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  ret
L64:
  mov    0x10(%rsp),%ebx
  lea    0x1(%rbx),%r14d
  lea    0x0(,%r14,4),%edi
  call   <malloc@plt>
  mov    %rax,%r13
  test   %r14d,%r14d
  jle    L45
  mov    %ebx,%ebx
  lea    0x4(%rax,%rbx,4),%rdx
L35:
  movl   $0x0,(%rax)
  add    $0x4,%rax
  cmp    %rdx,%rax
  jne    L35
L45:
  mov    %r13,%r8
  mov    0x14(%rsp),%ecx
  mov    %rbp,%rdx
  mov    0x10(%rsp),%esi
  mov    %r12,%rdi
  call   <add@plt>
  jmp    L132
L53:
  mov    0x10(%rsp),%eax
  lea    0x0(,%rax,4),%edi
  call   <malloc@plt>
  mov    %rax,%r13
  mov    %rax,%r8
  mov    0x14(%rsp),%ecx
  mov    %rbp,%rdx
  mov    0x10(%rsp),%esi
  mov    %r12,%rdi
  call   <substract@plt>
  jmp    L132
L25:
  mov    0x14(%rsp),%ebx
  add    0x10(%rsp),%ebx
  lea    0x0(,%rbx,4),%edi
  call   <malloc@plt>
  mov    %rax,%r13
  test   %ebx,%ebx
  jle    L77
  mov    %ebx,%ebx
  lea    (%rax,%rbx,4),%rdx
L58:
  movl   $0x0,(%rax)
  add    $0x4,%rax
  cmp    %rdx,%rax
  jne    L58
L77:
  mov    %r13,%r8
  mov    0x14(%rsp),%ecx
  mov    %rbp,%rdx
  mov    0x10(%rsp),%esi
  mov    %r12,%rdi
  call   <multiply@plt>
  jmp    L132
L105:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: extract_symbolic_data
arguments: data_tag: D31
type_infered: string
name: extract_symbolic_data
arguments: data_tag: D14
type_infered: string
name: extract_symbolic_data
arguments: data_tag: D12
type_infered: string

tool: D31: %d %d %c

tool: D14:  

tool: D12: %c

assistant: ```c
int main() {
  int x, y, *n1, *n2, *result, i, z;
  char c, aux;
  scanf("%d %d %c", &x, &y, &c);
  n1 = malloc(x * sizeof(int));
  n2 = malloc(y * sizeof(int));
  scanf(" ");
  for (i = x - 1; i >= 0; i--) {
    scanf("%c", &aux);
    n1[i] = aux - '0';
  }
  scanf(" ");
  for (i = y - 1; i >= 0; i--) {
    scanf("%c", &aux);
    n2[i] = aux - '0';
  }
  switch (c) {
  case 'A':
    z = x + 1;
    result = malloc(z * sizeof(int));
    for (i = 0; i < z; i++)
      result[i] = 0;
    add(n1, x, n2, y, result);
    break;
  case 'S':
    result = malloc(x * sizeof(int));
    substract(n1, x, n2, y, result);
    break;
  case 'M':
    z = x + y;
    result = malloc(z * sizeof(int));
    for (i = 0; i < z; i++)
      result[i] = 0;
    multiply(n1, x, n2, y, result);
    break;
  }
  free(n1);
  free(n2);
  free(result);
  return 0;
}
```