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

```asm
<fc_damerau0>:
  endbr64
  push   %r15
  mov    %edx,%r15d
  push   %r14
  push   %r13
  mov    %r8d,%r13d
  push   %r12
  mov    %rsi,%r12
  push   %rbp
  mov    %rdi,%rbp
  push   %rbx
  mov    %rcx,%rbx
  sub    $0x18,%rsp
  cmp    %r8d,%edx
  setge  %r14b
  cmp    $0x1000,%r8d
  setbe  %al
  xor    %edi,%edi
  and    %r14d,%eax
  cmp    $0x1000,%edx
  setbe  %dil
  and    %eax,%edi
  call   <assert@plt>
  movzbl %r14b,%edi
  call   <assert@plt>
  test   %r13d,%r13d
  jne    L134
  jmp    L83
  nopl   0x0(%rax,%rax,1)
L102:
  add    $0x8,%r12
  add    $0x8,%rbx
  sub    $0x1,%r15d
  sub    $0x1,%r13d
  je     L83
L134:
  mov    (%rbx),%rax
  cmp    %rax,(%r12)
  je     L102
  movslq %r13d,%rax
  movslq %r15d,%rdx
  sub    %rax,%rdx
  lea    (%r12,%rdx,8),%rcx
  jmp    L222
  xchg   %ax,%ax
L18:
  sub    $0x1,%rax
  sub    $0x1,%r15d
  test   %eax,%eax
  je     L83
L222:
  mov    -0x8(%rbx,%rax,8),%rsi
  mov    %eax,%edx
  mov    %eax,%r14d
  cmp    %rsi,-0x8(%rcx,%rax,8)
  je     L18
  lea    0x4(,%rax,4),%rax
  lea    0x0(%rbp,%rax,1),%r9
  mov    %rax,0x8(%rsp)
  lea    (%r9,%rax,1),%r8
  test   %edx,%edx
  js     L243
  lea    0x1(%rdx),%esi
  cmp    $0x2,%edx
  jbe    L166
  mov    %esi,%ecx
  movdqa D12(%rip),%xmm0
  movdqa D1(%rip),%xmm2
  mov    %r9,%rax
  shr    $0x2,%ecx
  sub    $0x1,%ecx
  shl    $0x4,%rcx
  lea    0x10(%r9,%rcx,1),%rcx
  nopl   0x0(%rax,%rax,1)
L110:
  movdqa %xmm0,%xmm1
  add    $0x10,%rax
  paddd  %xmm2,%xmm0
  movups %xmm1,-0x10(%rax)
  cmp    %rax,%rcx
  jne    L110
  mov    %esi,%eax
  and    $0xfffffffc,%eax
  and    $0x3,%esi
  je     L243
L249:
  movslq %eax,%rcx
  mov    %eax,(%r9,%rcx,4)
  lea    0x0(,%rcx,4),%rsi
  lea    0x1(%rax),%ecx
  cmp    %ecx,%r14d
  jl     L243
  add    $0x2,%eax
  mov    %ecx,0x4(%r9,%rsi,1)
  cmp    %r14d,%eax
  jg     L243
  mov    %eax,0x8(%r9,%rsi,1)
L243:
  test   %r15d,%r15d
  jle    L211
  add    $0x1,%r15d
  mov    $0x1,%r10d
  lea    0x1(%rdx),%r13d
  nop
L163:
  mov    %r10d,(%r8)
  test   %r14d,%r14d
  jle    L268
  mov    -0x8(%r12,%r10,8),%rsi
  mov    $0x1,%eax
  jmp    L170
  nopl   0x0(%rax)
L13:
  mov    (%r9,%rax,4),%r11d
  mov    -0x4(%r8,%rax,4),%edx
  add    $0x1,%r11d
  add    $0x1,%edx
  cmp    %r11d,%edx
  cmovg  %r11d,%edx
  add    $0x1,%edi
  cmp    %edi,%edx
  cmovg  %edi,%edx
  mov    %edx,(%r8,%rax,4)
  cmp    $0x1,%r10d
  jle    L107
  cmp    $0x1,%eax
  jle    L107
  cmp    -0x10(%r12,%r10,8),%rcx
  je     L251
L107:
  add    $0x1,%rax
  cmp    %r13,%rax
  je     L268
L170:
  mov    -0x8(%rbx,%rax,8),%rcx
  mov    -0x4(%r9,%rax,4),%edi
  cmp    %rcx,%rsi
  jne    L13
  mov    %edi,(%r8,%rax,4)
  add    $0x1,%rax
  cmp    %r13,%rax
  jne    L170
L268:
  add    $0x1,%r10
  mov    %r9,%rax
  mov    %r8,%r9
  cmp    %r10,%r15
  je     L181
  mov    %rbp,%r8
  mov    %rax,%rbp
  jmp    L163
  nopl   0x0(%rax)
L83:
  add    $0x18,%rsp
  mov    %r15d,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopw   0x0(%rax,%rax,1)
L251:
  cmp    -0x10(%rbx,%rax,8),%rsi
  jne    L107
  mov    -0x8(%rbp,%rax,4),%ecx
  add    $0x1,%ecx
  cmp    %edx,%ecx
  cmovg  %edx,%ecx
  mov    %ecx,(%r8,%rax,4)
  jmp    L107
L211:
  mov    %r9,%r8
L181:
  mov    0x8(%rsp),%rax
  mov    -0x4(%r8,%rax,1),%eax
  add    $0x18,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L166:
  xor    %eax,%eax
  jmp    L249
```

tool_calls: name: retrieve_data
arguments: data_label: D12
data_type: byte[16]
name: retrieve_data
arguments: data_label: D1
data_type: byte[16]

tool: {"D12": [0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x02,0x00,0x00,0x00,0x03,0x00,0x00,0x00]}

tool: {"D1": [0x04,0x00,0x00,0x00,0x04,0x00,0x00,0x00,0x04,0x00,0x00,0x00,0x04,0x00,0x00,0x00]}

assistant: ```c
int32_t fc_damerau0(int32_t *matrix, const char32_t *seq1, int32_t len1, const char32_t *seq2, int32_t len2) {
  assert((len1 >= 0 && len1 <= 4096) && (len2 >= 0 && len2 <= 4096) && len1 >= len2);
  do {
    assert(len1 >= len2);
    while (len2 && *seq1 == *seq2) {
      seq1++;
      seq2++;
      len1--;
      len2--;
    }
    while (len2 && seq1[len1 - 1] == seq2[len2 - 1]) {
      len1--;
      len2--;
    }
  } while (0);
  if (len2 == 0)
    return len1;
  int32_t *transpos = matrix;
  int32_t *previous = &transpos[len2 + 1];
  int32_t *current = &previous[len2 + 1];
  for (int32_t j = 0; j <= len2; j++)
    previous[j] = j;
  for (int32_t i = 1; i <= len1; i++) {
    current[0] = i;
    for (int32_t j = 1; j <= len2; j++) {
      if (seq1[i - 1] == seq2[j - 1]) {
        current[j] = previous[j - 1];
      } else {
        const int32_t ic = current[j - 1] + 1;
        const int32_t dc = previous[j] + 1;
        const int32_t rc = previous[j - 1] + 1;
        current[j] = ((ic) < (((dc) < (rc) ? (dc) : (rc))) ? (ic) : (((dc) < (rc) ? (dc) : (rc))));
        if ((i > 1 && j > 1 && seq1[i - 2] == seq2[j - 1] && seq1[i - 1] == seq2[j - 2])) {
          const int32_t tc = transpos[j - 2] + 1;
          current[j] = ((tc) < (current[j]) ? (tc) : (current[j]));
        }
      }
    }
    do {
      int32_t *tmp = transpos;
      transpos = previous;
      previous = current;
      current = tmp;
    } while (0);
  }
  return previous[len2];
}
```