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

```asm
<testLU>:
  endbr64
  push   %r15
  mov    $0x2,%esi
  mov    $0x2,%edi
  push   %r14
  push   %r13
  push   %r12
  push   %rbx
  sub    $0x40,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x38(%rsp)
  xor    %eax,%eax
  mov    %rsp,%rdx
  lea    0x10(%rsp),%r14
  lea    0x18(%rsp),%r15
  call   <zeros@plt>
  mov    (%rsp),%rax
  lea    0x8(%rsp),%rdx
  movapd D3(%rip),%xmm1
  mov    $0x1,%esi
  mov    $0x2,%edi
  lea    0x20(%rsp),%r13
  movapd D35(%rip),%xmm0
  movups %xmm1,0x10(%rax)
  lea    0x28(%rsp),%r12
  lea    0x30(%rsp),%rbx
  movups %xmm0,(%rax)
  call   <zeros@plt>
  movapd D35(%rip),%xmm0
  mov    0x8(%rsp),%rax
  mov    %r14,%rdx
  mov    $0x2,%esi
  mov    $0x2,%edi
  movups %xmm0,(%rax)
  call   <zeros@plt>
  mov    %r15,%rdx
  mov    $0x2,%esi
  mov    $0x2,%edi
  call   <zeros@plt>
  mov    %r13,%rdx
  mov    $0x1,%esi
  mov    $0x2,%edi
  call   <zeros@plt>
  mov    %r12,%rdx
  mov    $0x1,%esi
  mov    $0x2,%edi
  call   <zeros@plt>
  lea    D36(%rip),%rdi
  call   <printf@plt>
  mov    (%rsp),%rdi
  mov    $0x2,%edx
  mov    $0x2,%esi
  call   <print@plt>
  lea    D66(%rip),%rdi
  call   <printf@plt>
  mov    0x8(%rsp),%rdi
  mov    $0x1,%edx
  mov    $0x2,%esi
  call   <print@plt>
  mov    (%rsp),%rdi
  mov    %r15,%rcx
  mov    %r14,%rdx
  mov    $0x2,%esi
  call   <LUDecomposition@plt>
  lea    D45(%rip),%rdi
  call   <printf@plt>
  mov    0x10(%rsp),%rdi
  mov    $0x2,%edx
  mov    $0x2,%esi
  call   <print@plt>
  lea    D5(%rip),%rdi
  call   <printf@plt>
  mov    0x18(%rsp),%rdi
  mov    $0x2,%edx
  mov    $0x2,%esi
  call   <print@plt>
  mov    0x8(%rsp),%rsi
  mov    0x10(%rsp),%rdi
  mov    %r13,%rcx
  mov    $0x1,%r8d
  mov    $0x2,%edx
  call   <BackSubstitution@plt>
  mov    0x20(%rsp),%rsi
  xor    %r8d,%r8d
  mov    %r12,%rcx
  mov    0x18(%rsp),%rdi
  mov    $0x2,%edx
  call   <BackSubstitution@plt>
  lea    D7(%rip),%rdi
  call   <printf@plt>
  mov    0x28(%rsp),%rdi
  mov    $0x1,%edx
  mov    $0x2,%esi
  call   <print@plt>
  mov    %rbx,%rdx
  mov    $0x1,%esi
  mov    $0x2,%edi
  call   <zeros@plt>
  sub    $0x8,%rsp
  mov    $0x1,%r9d
  mov    $0x2,%r8d
  push   %rbx
  mov    0x38(%rsp),%rsi
  mov    $0x2,%ecx
  mov    $0x2,%edx
  mov    0x10(%rsp),%rdi
  call   <mult@plt>
  mov    0x40(%rsp),%rdi
  mov    $0x1,%edx
  mov    $0x2,%esi
  call   <print@plt>
  pop    %rax
  pop    %rdx
  mov    0x38(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L6
  add    $0x40,%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L6:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: extract_symbolic_data
arguments: data_label: D3
data_type: byte[16]
name: extract_symbolic_data
arguments: data_label: D35
data_type: byte[16]
name: extract_symbolic_data
arguments: data_label: D36
data_type: string
name: extract_symbolic_data
arguments: data_label: D66
data_type: string
name: extract_symbolic_data
arguments: data_label: D45
data_type: string
name: extract_symbolic_data
arguments: data_label: D5
data_type: string
name: extract_symbolic_data
arguments: data_label: D7
data_type: string

tool: {"D3": [0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x10,0x40]}

tool: {"D35": [0x00,0x00,0x00,0x00,0x00,0x00,0xf0,0x3f,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x40]}

tool: D36: A


tool: D66: B


tool: D45: L


tool: D5: U


tool: D7: x


assistant: ```c
void testLU() {
  double *mat;
  zeros(2, 2, &mat);
  mat[0] = 1;
  mat[1] = 2;
  mat[1 * 2] = 3;
  mat[1 * 2 + 1] = 4;
  double *b;
  zeros(2, 1, &b);
  b[0] = 1;
  b[1] = 2;
  double *L, *U, *z, *x;
  zeros(2, 2, &L);
  zeros(2, 2, &U);
  zeros(2, 1, &z);
  zeros(2, 1, &x);
  printf("A\n");
  print(mat, 2, 2);
  printf("B\n");
  print(b, 2, 1);
  LUDecomposition(mat, 2, &L, &U);
  printf("L\n");
  print(L, 2, 2);
  printf("U\n");
  print(U, 2, 2);
  BackSubstitution(L, b, 2, &z, 1);
  BackSubstitution(U, z, 2, &x, 0);
  printf("x\n");
  print(x, 2, 1);
  double *bstar;
  zeros(2, 1, &bstar);
  mult(mat, x, 2, 2, 2, 1, &bstar);
  print(bstar, 2, 1);
}
```