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

```asm
<lcsq>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbx
  sub    $0x38,%rsp
  mov    %rdi,%r14
  mov    %rsi,%r13
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  call   <strlen@plt>
  mov    %rax,%r15
  lea    0x1(%rax),%eax
  mov    %eax,-0x54(%rbp)
  mov    %r13,%rdi
  call   <strlen@plt>
  mov    %rax,-0x50(%rbp)
  lea    0x1(%rax),%r12d
  mov    %rsp,%rax
L14:
  cmp    %rax,%rsp
  je     L143
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L14
L143:
  sub    $0x400,%rsp
  orq    $0x0,0x3f8(%rsp)
  mov    %rsp,-0x60(%rbp)
  mov    -0x54(%rbp),%ebx
  mov    %ebx,%edi
  imul   %r12d,%edi
  movslq %edi,%rdi
  mov    $0x4,%esi
  call   <calloc@plt>
  mov    %rax,-0x48(%rbp)
  mov    %ebx,-0x54(%rbp)
  movslq %ebx,%rdi
  shl    $0x3,%rdi
  call   <malloc@plt>
  mov    %rax,%rbx
  cmpl   $0x0,-0x54(%rbp)
  jle    L124
  movslq %r12d,%rcx
  shl    $0x2,%rcx
  mov    -0x48(%rbp),%rdx
  mov    %r15d,%esi
  lea    0x8(%rax,%rsi,8),%rsi
L166:
  mov    %rdx,(%rax)
  add    %rcx,%rdx
  add    $0x8,%rax
  cmp    %rsi,%rax
  jne    L166
L124:
  movzbl (%r14),%r10d
  test   %r10b,%r10b
  je     L146
  movzbl 0x0(%r13),%r12d
  mov    %rbx,%rdi
  mov    %r14,%r11
  jmp    L195
L38:
  mov    0x8(%rdi),%r8
  mov    (%rdi),%rdx
  mov    (%rdx,%rax,1),%edx
  mov    (%r8,%rsi,1),%r9d
  cmp    %r9d,%edx
  cmovl  %r9d,%edx
  mov    %edx,(%r8,%rax,1)
L135:
  add    $0x1,%rcx
  movzbl (%rcx),%edx
  add    $0x4,%rsi
  add    $0x4,%rax
  test   %dl,%dl
  je     L72
L109:
  cmp    %r10b,%dl
  jne    L38
  mov    0x8(%rdi),%r8
  mov    (%rdi),%rdx
  mov    (%rdx,%rsi,1),%edx
  add    $0x1,%edx
  mov    %edx,(%r8,%rax,1)
  jmp    L135
L72:
  add    $0x1,%r11
  movzbl (%r11),%r10d
  add    $0x8,%rdi
  test   %r10b,%r10b
  je     L146
L195:
  test   %r12b,%r12b
  je     L72
  mov    %r13,%rcx
  mov    %r12d,%edx
  mov    $0x4,%eax
  mov    $0x0,%esi
  jmp    L109
L146:
  mov    -0x60(%rbp),%rax
  lea    0x3ff(%rax),%r12
  movb   $0x0,0x3ff(%rax)
  mov    %r15d,%edx
  mov    -0x50(%rbp),%rax
  mov    %eax,%esi
  test   %r15d,%r15d
  jle    L73
  test   %eax,%eax
  jg     L159
L73:
  mov    -0x48(%rbp),%rdi
  call   <free@plt>
  mov    %rbx,%rdi
  call   <free@plt>
  mov    %r12,%rdi
  call   <strdup@plt>
  mov    -0x38(%rbp),%rdx
  sub    %fs:0x28,%rdx
  jne    L83
  lea    -0x28(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
L96:
  sub    $0x1,%edx
L196:
  test   %edx,%edx
  jle    L73
  test   %esi,%esi
  jle    L73
L159:
  movslq %edx,%rcx
  mov    (%rbx,%rcx,8),%rdi
  movslq %esi,%rax
  lea    0x0(,%rax,4),%r10
  mov    (%rdi,%rax,4),%r8d
  mov    -0x8(%rbx,%rcx,8),%r9
  cmp    (%r9,%rax,4),%r8d
  je     L96
  cmp    -0x4(%rdi,%r10,1),%r8d
  je     L202
  movzbl -0x1(%r14,%rcx,1),%eax
  mov    %al,-0x1(%r12)
  sub    $0x1,%edx
  sub    $0x1,%esi
  lea    -0x1(%r12),%r12
  jmp    L196
L202:
  sub    $0x1,%esi
  jmp    L196
L83:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
char *lcsq(const char *a, const char *b) {
  int lena = strlen(a) + 1;
  int lenb = strlen(b) + 1;
  int bufrlen = 1024;
  char bufr[bufrlen], *result;
  int i, j;
  const char *x, *y;
  int *la = calloc(lena * lenb, sizeof(int));
  int **lengths = malloc(lena * sizeof(int *));
  for (i = 0; i < lena; i++)
    lengths[i] = la + i * lenb;
  for (i = 0, x = a; *x; i++, x++) {
    for (j = 0, y = b; *y; j++, y++) {
      if (*x == *y) {
        lengths[i + 1][j + 1] = lengths[i][j] + 1;
      } else {
        int ml = (((lengths[i + 1][j]) > (lengths[i][j + 1])) ? (lengths[i + 1][j]) : (lengths[i][j + 1]));
        lengths[i + 1][j + 1] = ml;
      }
    }
  }
  result = bufr + bufrlen;
  *--result = '\0';
  i = lena - 1;
  j = lenb - 1;
  while ((i > 0) && (j > 0)) {
    if (lengths[i][j] == lengths[i - 1][j])
      i -= 1;
    else if (lengths[i][j] == lengths[i][j - 1])
      j -= 1;
    else {
      *--result = a[i - 1];
      i -= 1;
      j -= 1;
    }
  }
  free(la);
  free(lengths);
  return strdup(result);
}
```