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

```asm
<fc_damerau0>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x60,%rsp
  mov    %rdi,-0x48(%rbp)
  mov    %rsi,-0x50(%rbp)
  mov    %edx,-0x54(%rbp)
  mov    %rcx,-0x60(%rbp)
  mov    %r8d,-0x58(%rbp)
  cmpl   $0x0,-0x54(%rbp)
  js     L45
  cmpl   $0x1000,-0x54(%rbp)
  jg     L45
  cmpl   $0x0,-0x58(%rbp)
  js     L45
  cmpl   $0x1000,-0x58(%rbp)
  jg     L45
  mov    -0x54(%rbp),%eax
  cmp    -0x58(%rbp),%eax
  jl     L45
  mov    $0x1,%eax
  jmp    L113
L45:
  mov    $0x0,%eax
L113:
  mov    %eax,%edi
  call   <assert@plt>
  mov    -0x54(%rbp),%eax
  cmp    -0x58(%rbp),%eax
  setge  %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  jmp    L9
L30:
  addq   $0x8,-0x50(%rbp)
  addq   $0x8,-0x60(%rbp)
  subl   $0x1,-0x54(%rbp)
  subl   $0x1,-0x58(%rbp)
L9:
  cmpl   $0x0,-0x58(%rbp)
  je     L255
  mov    -0x50(%rbp),%rax
  mov    (%rax),%rdx
  mov    -0x60(%rbp),%rax
  mov    (%rax),%rax
  cmp    %rax,%rdx
  je     L30
  jmp    L255
L21:
  subl   $0x1,-0x54(%rbp)
  subl   $0x1,-0x58(%rbp)
L255:
  cmpl   $0x0,-0x58(%rbp)
  je     L79
  mov    -0x54(%rbp),%eax
  cltq
  shl    $0x3,%rax
  lea    -0x8(%rax),%rdx
  mov    -0x50(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x58(%rbp),%eax
  cltq
  shl    $0x3,%rax
  lea    -0x8(%rax),%rcx
  mov    -0x60(%rbp),%rax
  add    %rcx,%rax
  mov    (%rax),%rax
  cmp    %rax,%rdx
  je     L21
L79:
  cmpl   $0x0,-0x58(%rbp)
  jne    L55
  mov    -0x54(%rbp),%eax
  jmp    L150
L55:
  mov    -0x48(%rbp),%rax
  mov    %rax,-0x20(%rbp)
  mov    -0x58(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x18(%rbp)
  mov    -0x58(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x10(%rbp)
  movl   $0x0,-0x3c(%rbp)
  jmp    L158
L17:
  mov    -0x3c(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x18(%rbp),%rax
  add    %rax,%rdx
  mov    -0x3c(%rbp),%eax
  mov    %eax,(%rdx)
  addl   $0x1,-0x3c(%rbp)
L158:
  mov    -0x3c(%rbp),%eax
  cmp    -0x58(%rbp),%eax
  jle    L17
  movl   $0x1,-0x38(%rbp)
  jmp    L92
L165:
  mov    -0x10(%rbp),%rax
  mov    -0x38(%rbp),%edx
  mov    %edx,(%rax)
  movl   $0x1,-0x34(%rbp)
  jmp    L120
L16:
  mov    -0x38(%rbp),%eax
  cltq
  shl    $0x3,%rax
  lea    -0x8(%rax),%rdx
  mov    -0x50(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x34(%rbp),%eax
  cltq
  shl    $0x3,%rax
  lea    -0x8(%rax),%rcx
  mov    -0x60(%rbp),%rax
  add    %rcx,%rax
  mov    (%rax),%rax
  cmp    %rax,%rdx
  jne    L8
  mov    -0x34(%rbp),%eax
  cltq
  shl    $0x2,%rax
  lea    -0x4(%rax),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    -0x34(%rbp),%edx
  movslq %edx,%rdx
  lea    0x0(,%rdx,4),%rcx
  mov    -0x10(%rbp),%rdx
  add    %rcx,%rdx
  mov    (%rax),%eax
  mov    %eax,(%rdx)
  jmp    L213
L8:
  mov    -0x34(%rbp),%eax
  cltq
  shl    $0x2,%rax
  lea    -0x4(%rax),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  add    $0x1,%eax
  mov    %eax,-0x30(%rbp)
  mov    -0x34(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  add    $0x1,%eax
  mov    %eax,-0x2c(%rbp)
  mov    -0x34(%rbp),%eax
  cltq
  shl    $0x2,%rax
  lea    -0x4(%rax),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  add    $0x1,%eax
  mov    %eax,-0x28(%rbp)
  mov    -0x28(%rbp),%edx
  mov    -0x2c(%rbp),%eax
  cmp    %eax,%edx
  cmovg  %eax,%edx
  mov    -0x34(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x10(%rbp),%rax
  add    %rax,%rcx
  mov    -0x30(%rbp),%eax
  cmp    %eax,%edx
  cmovle %edx,%eax
  mov    %eax,(%rcx)
  cmpl   $0x1,-0x38(%rbp)
  jle    L213
  cmpl   $0x1,-0x34(%rbp)
  jle    L213
  mov    -0x38(%rbp),%eax
  cltq
  shl    $0x3,%rax
  lea    -0x10(%rax),%rdx
  mov    -0x50(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x34(%rbp),%eax
  cltq
  shl    $0x3,%rax
  lea    -0x8(%rax),%rcx
  mov    -0x60(%rbp),%rax
  add    %rcx,%rax
  mov    (%rax),%rax
  cmp    %rax,%rdx
  jne    L213
  mov    -0x38(%rbp),%eax
  cltq
  shl    $0x3,%rax
  lea    -0x8(%rax),%rdx
  mov    -0x50(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x34(%rbp),%eax
  cltq
  shl    $0x3,%rax
  lea    -0x10(%rax),%rcx
  mov    -0x60(%rbp),%rax
  add    %rcx,%rax
  mov    (%rax),%rax
  cmp    %rax,%rdx
  jne    L213
  mov    -0x34(%rbp),%eax
  cltq
  shl    $0x2,%rax
  lea    -0x8(%rax),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  add    $0x1,%eax
  mov    %eax,-0x24(%rbp)
  mov    -0x34(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x34(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x10(%rbp),%rax
  add    %rax,%rcx
  mov    -0x24(%rbp),%eax
  cmp    %eax,%edx
  cmovle %edx,%eax
  mov    %eax,(%rcx)
L213:
  addl   $0x1,-0x34(%rbp)
L120:
  mov    -0x34(%rbp),%eax
  cmp    -0x58(%rbp),%eax
  jle    L16
  mov    -0x20(%rbp),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x18(%rbp),%rax
  mov    %rax,-0x20(%rbp)
  mov    -0x10(%rbp),%rax
  mov    %rax,-0x18(%rbp)
  mov    -0x8(%rbp),%rax
  mov    %rax,-0x10(%rbp)
  addl   $0x1,-0x38(%rbp)
L92:
  mov    -0x38(%rbp),%eax
  cmp    -0x54(%rbp),%eax
  jle    L165
  mov    -0x58(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
L150:
  leave
  ret
```

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];
}
```