user: What would the C source look like for the assembly code provided here?

```asm
<main>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbx
  sub    $0x88,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  lea    D1(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  lea    D32(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  jmp    L43
L93:
  mov    %rsp,%rax
  mov    %rax,-0xa8(%rbp)
  mov    -0x68(%rbp),%rsi
  mov    -0x70(%rbp),%rdi
  mov    %rsi,%rax
  sub    $0x1,%rax
  mov    %rax,-0x50(%rbp)
  mov    %rsi,-0xa0(%rbp)
  movq   $0x0,-0x98(%rbp)
  lea    0x0(,%rsi,4),%rbx
  mov    %rdi,%rax
  sub    $0x1,%rax
  mov    %rax,-0x48(%rbp)
  mov    %rsi,%r12
  mov    $0x0,%r13d
  mov    %rdi,%r14
  mov    $0x0,%r15d
  mov    %r13,%rdx
  imul   %r14,%rdx
  mov    %r15,%rax
  imul   %r12,%rax
  lea    (%rdx,%rax,1),%rcx
  mov    %r12,%rax
  mul    %r14
  add    %rdx,%rcx
  mov    %rcx,%rdx
  mov    %rsi,-0x80(%rbp)
  movq   $0x0,-0x78(%rbp)
  mov    %rdi,-0x90(%rbp)
  movq   $0x0,-0x88(%rbp)
  mov    -0x80(%rbp),%r8
  mov    -0x78(%rbp),%r9
  mov    %r9,%rdx
  mov    -0x90(%rbp),%r10
  mov    -0x88(%rbp),%r11
  imul   %r10,%rdx
  mov    %r11,%rax
  imul   %r8,%rax
  lea    (%rdx,%rax,1),%rcx
  mov    %r8,%rax
  mul    %r10
  add    %rdx,%rcx
  mov    %rcx,%rdx
  mov    %rsi,%rax
  imul   %rdi,%rax
  lea    0x0(,%rax,4),%rdx
  mov    $0x10,%eax
  sub    $0x1,%rax
  add    %rdx,%rax
  mov    $0x10,%esi
  mov    $0x0,%edx
  div    %rsi
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L18:
  cmp    %rdx,%rsp
  je     L67
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L18
L67:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L63
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L63:
  mov    %rsp,%rax
  add    $0x3,%rax
  shr    $0x2,%rax
  shl    $0x2,%rax
  mov    %rax,-0x40(%rbp)
  movq   $0x0,-0x60(%rbp)
  jmp    L88
L0:
  movq   $0x0,-0x58(%rbp)
  jmp    L1
L50:
  mov    %rbx,%rax
  shr    $0x2,%rax
  imul   -0x60(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x58(%rbp),%rax
  add    %rdx,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,%rsi
  lea    D48(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <scanf@plt>
  addq   $0x1,-0x58(%rbp)
L1:
  mov    -0x68(%rbp),%rax
  cmp    %rax,-0x58(%rbp)
  jb     L50
  addq   $0x1,-0x60(%rbp)
L88:
  mov    -0x70(%rbp),%rax
  cmp    %rax,-0x60(%rbp)
  jb     L0
  mov    -0x68(%rbp),%rcx
  mov    -0x70(%rbp),%rax
  mov    -0x40(%rbp),%rdx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <all_submatrices@plt>
  lea    D32(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    -0xa8(%rbp),%rsp
L43:
  lea    -0x68(%rbp),%rdx
  lea    -0x70(%rbp),%rax
  mov    %rax,%rsi
  lea    D15(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <scanf@plt>
  cmp    $0x2,%eax
  je     L93
  mov    $0x0,%eax
  mov    -0x38(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L10
  call   <__stack_chk_fail@plt>
L10:
  lea    -0x28(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
```

tool_calls: name: unpack_data
arguments: data_tag: D1
data_type: string
name: unpack_data
arguments: data_tag: D32
data_type: string
name: unpack_data
arguments: data_tag: D48
data_type: string
name: unpack_data
arguments: data_tag: D15
data_type: string

tool: D1: Enter the matrix dimensions, followed by the elements.


tool: D32: > 

tool: D48: %d

tool: D15: %zu%zu

assistant: ```c
int main(void) {
  printf("Enter the matrix dimensions, followed by the elements.\n");
  printf("> ");
  size_t N, M;
  while (scanf("%zu%zu", &N, &M) == 2) {
    int matrix[N][M];
    size_t i, j;
    for (i = 0; i < N; i++) {
      for (j = 0; j < M; j++) {
        scanf("%d", &matrix[i][j]);
      }
    }
    all_submatrices(N, M, matrix);
    printf("> ");
  }
  return 0;
}
```