user: Please show me the C implementation that matches the assembly code listed below:

```asm
<narrowbandUnitCostDistanceNoEndPenaltySeq2LowMem>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %rbx
  sub    $0x68,%rsp
  mov    %rdi,-0x58(%rbp)
  mov    %rsi,-0x60(%rbp)
  mov    %edx,-0x64(%rbp)
  mov    %ecx,-0x68(%rbp)
  mov    %r8d,-0x6c(%rbp)
  mov    -0x64(%rbp),%eax
  cmp    -0x68(%rbp),%eax
  jle    L316
  mov    $0xffffffff,%eax
  jmp    L342
L316:
  mov    -0x64(%rbp),%eax
  add    $0x1,%eax
  cltq
  mov    $0x8,%esi
  mov    %rax,%rdi
  call   <calloc@plt>
  mov    %rax,-0x18(%rbp)
  movl   $0x0,-0x48(%rbp)
  jmp    L357
L283:
  mov    -0x48(%rbp),%eax
  sub    -0x6c(%rbp),%eax
  mov    %eax,-0x40(%rbp)
  mov    -0x48(%rbp),%edx
  mov    -0x6c(%rbp),%eax
  add    %edx,%eax
  mov    %eax,-0x3c(%rbp)
  movl   $0x0,-0x38(%rbp)
  cmpl   $0x0,-0x40(%rbp)
  jg     L322
  movl   $0x0,-0x40(%rbp)
  jmp    L317
L322:
  movl   $0x1,-0x38(%rbp)
L317:
  movl   $0x0,-0x34(%rbp)
  mov    -0x3c(%rbp),%eax
  cmp    -0x68(%rbp),%eax
  jl     L279
  mov    -0x68(%rbp),%eax
  mov    %eax,-0x3c(%rbp)
  jmp    L34
L279:
  movl   $0x1,-0x34(%rbp)
L34:
  mov    -0x3c(%rbp),%eax
  sub    -0x40(%rbp),%eax
  add    $0x1,%eax
  mov    %eax,-0x2c(%rbp)
  mov    -0x38(%rbp),%edx
  mov    -0x2c(%rbp),%eax
  add    %eax,%edx
  mov    -0x34(%rbp),%eax
  add    %edx,%eax
  cltq
  mov    -0x48(%rbp),%edx
  movslq %edx,%rdx
  lea    0x0(,%rdx,8),%rcx
  mov    -0x18(%rbp),%rdx
  lea    (%rcx,%rdx,1),%rbx
  mov    $0x4,%esi
  mov    %rax,%rdi
  call   <calloc@plt>
  mov    %rax,(%rbx)
  addl   $0x1,-0x48(%rbp)
L357:
  mov    -0x48(%rbp),%eax
  cmp    -0x64(%rbp),%eax
  jle    L283
  movl   $0x0,-0x48(%rbp)
  mov    -0x48(%rbp),%eax
  sub    -0x6c(%rbp),%eax
  mov    %eax,-0x40(%rbp)
  mov    -0x48(%rbp),%edx
  mov    -0x6c(%rbp),%eax
  add    %edx,%eax
  mov    %eax,-0x3c(%rbp)
  movl   $0x0,-0x38(%rbp)
  cmpl   $0x0,-0x40(%rbp)
  jg     L42
  movl   $0x0,-0x40(%rbp)
  jmp    L270
L42:
  movl   $0x1,-0x38(%rbp)
L270:
  movl   $0x0,-0x34(%rbp)
  mov    -0x3c(%rbp),%eax
  cmp    -0x68(%rbp),%eax
  jl     L118
  mov    -0x68(%rbp),%eax
  mov    %eax,-0x3c(%rbp)
  jmp    L159
L118:
  movl   $0x1,-0x34(%rbp)
L159:
  mov    -0x3c(%rbp),%eax
  sub    -0x40(%rbp),%eax
  add    $0x1,%eax
  mov    %eax,-0x2c(%rbp)
  cmpl   $0x0,-0x38(%rbp)
  je     L87
  mov    -0x48(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rax
  movl   $0x3e8,(%rax)
L87:
  mov    -0x38(%rbp),%eax
  mov    %eax,-0x44(%rbp)
  jmp    L20
L154:
  mov    -0x48(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x44(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rax,%rdx
  mov    -0x44(%rbp),%eax
  mov    %eax,(%rdx)
  addl   $0x1,-0x44(%rbp)
L20:
  mov    -0x38(%rbp),%edx
  mov    -0x2c(%rbp),%eax
  add    %edx,%eax
  cmp    %eax,-0x44(%rbp)
  jl     L154
  cmpl   $0x0,-0x34(%rbp)
  je     L138
  mov    -0x48(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x38(%rbp),%ecx
  mov    -0x2c(%rbp),%eax
  add    %eax,%ecx
  mov    -0x34(%rbp),%eax
  add    %ecx,%eax
  cltq
  shl    $0x2,%rax
  sub    $0x4,%rax
  add    %rdx,%rax
  movl   $0x3e8,(%rax)
L138:
  mov    -0x38(%rbp),%eax
  mov    %eax,-0x30(%rbp)
  movl   $0x1,-0x48(%rbp)
  jmp    L377
L69:
  mov    -0x48(%rbp),%eax
  sub    -0x6c(%rbp),%eax
  mov    %eax,-0x40(%rbp)
  mov    -0x48(%rbp),%edx
  mov    -0x6c(%rbp),%eax
  add    %edx,%eax
  mov    %eax,-0x3c(%rbp)
  movl   $0x0,-0x38(%rbp)
  cmpl   $0x0,-0x40(%rbp)
  jg     L21
  movl   $0x0,-0x40(%rbp)
  jmp    L32
L21:
  movl   $0x1,-0x38(%rbp)
L32:
  movl   $0x0,-0x34(%rbp)
  mov    -0x3c(%rbp),%eax
  cmp    -0x68(%rbp),%eax
  jl     L282
  mov    -0x68(%rbp),%eax
  mov    %eax,-0x3c(%rbp)
  jmp    L271
L282:
  movl   $0x1,-0x34(%rbp)
L271:
  mov    -0x3c(%rbp),%eax
  sub    -0x40(%rbp),%eax
  add    $0x1,%eax
  mov    %eax,-0x2c(%rbp)
  cmpl   $0x0,-0x38(%rbp)
  je     L359
  mov    -0x48(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rax
  movl   $0x3e8,(%rax)
L359:
  mov    -0x38(%rbp),%eax
  mov    %eax,-0x44(%rbp)
  jmp    L183
L210:
  cmpl   $0x0,-0x44(%rbp)
  jne    L238
  mov    -0x48(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rax
  mov    -0x48(%rbp),%edx
  mov    %edx,(%rax)
  jmp    L371
L238:
  mov    -0x48(%rbp),%eax
  cltq
  lea    -0x1(%rax),%rdx
  mov    -0x58(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%edx
  mov    -0x40(%rbp),%ecx
  mov    -0x44(%rbp),%eax
  add    %ecx,%eax
  sub    -0x38(%rbp),%eax
  cltq
  lea    -0x1(%rax),%rcx
  mov    -0x60(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  cmp    %al,%dl
  setne  %al
  movzbl %al,%eax
  mov    %eax,-0x28(%rbp)
  mov    -0x48(%rbp),%eax
  cltq
  shl    $0x3,%rax
  lea    -0x8(%rax),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x44(%rbp),%ecx
  mov    -0x30(%rbp),%eax
  add    %ecx,%eax
  cltq
  shl    $0x2,%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  add    $0x1,%eax
  mov    %eax,-0x24(%rbp)
  mov    -0x48(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x44(%rbp),%eax
  cltq
  shl    $0x2,%rax
  sub    $0x4,%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  add    $0x1,%eax
  mov    %eax,-0x20(%rbp)
  mov    -0x48(%rbp),%eax
  cltq
  shl    $0x3,%rax
  lea    -0x8(%rax),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    $0x1,%eax
  sub    -0x30(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x44(%rbp),%eax
  sub    %ecx,%eax
  cltq
  shl    $0x2,%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x28(%rbp),%eax
  add    %edx,%eax
  mov    %eax,-0x1c(%rbp)
  mov    -0x1c(%rbp),%eax
  cmp    -0x20(%rbp),%eax
  jg     L131
  mov    -0x1c(%rbp),%edx
  mov    -0x24(%rbp),%eax
  cmp    %eax,%edx
  cmovle %edx,%eax
  jmp    L337
L131:
  mov    -0x20(%rbp),%edx
  mov    -0x24(%rbp),%eax
  cmp    %eax,%edx
  cmovle %edx,%eax
L337:
  mov    -0x48(%rbp),%edx
  movslq %edx,%rdx
  lea    0x0(,%rdx,8),%rcx
  mov    -0x18(%rbp),%rdx
  add    %rcx,%rdx
  mov    (%rdx),%rcx
  mov    -0x44(%rbp),%edx
  movslq %edx,%rdx
  shl    $0x2,%rdx
  add    %rcx,%rdx
  mov    %eax,(%rdx)
L371:
  addl   $0x1,-0x44(%rbp)
L183:
  mov    -0x38(%rbp),%edx
  mov    -0x2c(%rbp),%eax
  add    %edx,%eax
  cmp    %eax,-0x44(%rbp)
  jl     L210
  cmpl   $0x0,-0x34(%rbp)
  je     L85
  mov    -0x48(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x38(%rbp),%ecx
  mov    -0x2c(%rbp),%eax
  add    %eax,%ecx
  mov    -0x34(%rbp),%eax
  add    %ecx,%eax
  cltq
  shl    $0x2,%rax
  sub    $0x4,%rax
  add    %rdx,%rax
  movl   $0x3e8,(%rax)
L85:
  mov    -0x38(%rbp),%eax
  mov    %eax,-0x30(%rbp)
  addl   $0x1,-0x48(%rbp)
L377:
  mov    -0x48(%rbp),%eax
  cmp    -0x64(%rbp),%eax
  jle    L69
  mov    -0x64(%rbp),%eax
  mov    %eax,-0x48(%rbp)
  mov    -0x48(%rbp),%eax
  sub    -0x6c(%rbp),%eax
  mov    %eax,-0x40(%rbp)
  mov    -0x48(%rbp),%edx
  mov    -0x6c(%rbp),%eax
  add    %edx,%eax
  mov    %eax,-0x3c(%rbp)
  movl   $0x0,-0x38(%rbp)
  cmpl   $0x0,-0x40(%rbp)
  jg     L373
  movl   $0x0,-0x40(%rbp)
  jmp    L172
L373:
  movl   $0x1,-0x38(%rbp)
L172:
  movl   $0x0,-0x34(%rbp)
  mov    -0x3c(%rbp),%eax
  cmp    -0x68(%rbp),%eax
  jl     L199
  mov    -0x68(%rbp),%eax
  mov    %eax,-0x3c(%rbp)
  jmp    L182
L199:
  movl   $0x1,-0x34(%rbp)
L182:
  mov    -0x3c(%rbp),%eax
  sub    -0x40(%rbp),%eax
  add    $0x1,%eax
  mov    %eax,-0x2c(%rbp)
  mov    -0x48(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rax
  mov    (%rax),%eax
  mov    %eax,-0x4c(%rbp)
  movl   $0x1,-0x44(%rbp)
  jmp    L346
L245:
  mov    -0x48(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x44(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  cmp    %eax,-0x4c(%rbp)
  jle    L336
  mov    -0x48(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x44(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  mov    %eax,-0x4c(%rbp)
L336:
  addl   $0x1,-0x44(%rbp)
L346:
  mov    -0x38(%rbp),%edx
  mov    -0x2c(%rbp),%eax
  add    %eax,%edx
  mov    -0x34(%rbp),%eax
  add    %edx,%eax
  cmp    %eax,-0x44(%rbp)
  jl     L245
  movl   $0x0,-0x48(%rbp)
  jmp    L83
L88:
  mov    -0x48(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rax
  mov    %rax,%rdi
  call   <free@plt>
  addl   $0x1,-0x48(%rbp)
L83:
  mov    -0x48(%rbp),%eax
  cmp    -0x64(%rbp),%eax
  jle    L88
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    -0x4c(%rbp),%eax
L342:
  mov    -0x8(%rbp),%rbx
  leave
  ret
```

assistant: ```c
int narrowbandUnitCostDistanceNoEndPenaltySeq2LowMem(char *seq1, char *seq2, int len1, int len2, int maxerr) {
  int **S;
  int score;
  int row, col;
  int match;
  int left, up, diagonal;
  int from, to;
  int rowlength;
  int leftboundary, rightboundary;
  int previousleftboundary;
  if (len1 > len2) {
    return (-1);
  }
  S = (int **)calloc((len1 + 1), sizeof(int *));
  for (row = 0; row <= len1; row++) {
    from = row - maxerr;
    to = row + maxerr;
    leftboundary = 0;
    if (from <= 0)
      from = 0;
    else
      leftboundary = 1;
    rightboundary = 0;
    if (to >= len2)
      to = len2;
    else
      rightboundary = 1;
    rowlength = to - from + 1;
    S[row] = (int *)calloc(leftboundary + rowlength + rightboundary, sizeof(int));
  }
  row = 0;
  from = row - maxerr;
  to = row + maxerr;
  leftboundary = 0;
  if (from <= 0)
    from = 0;
  else
    leftboundary = 1;
  rightboundary = 0;
  if (to >= len2)
    to = len2;
  else
    rightboundary = 1;
  rowlength = to - from + 1;
  if (leftboundary) {
    S[row][0] = 1000;
  }
  for (col = leftboundary; col <= leftboundary + rowlength - 1; col++) {
    S[row][col] = col;
  }
  if (rightboundary) {
    S[row][leftboundary + rowlength + rightboundary - 1] = 1000;
  }
  previousleftboundary = leftboundary;
  for (row = 1; row <= len1; row++) {
    from = row - maxerr;
    to = row + maxerr;
    leftboundary = 0;
    if (from <= 0)
      from = 0;
    else
      leftboundary = 1;
    rightboundary = 0;
    if (to >= len2)
      to = len2;
    else
      rightboundary = 1;
    rowlength = to - from + 1;
    if (leftboundary) {
      S[row][0] = 1000;
    }
    for (col = leftboundary; col <= leftboundary + rowlength - 1; col++) {
      if (col == 0)
        S[row][0] = row;
      else {
        match = (seq1[row - 1] == seq2[from + col - leftboundary - 1]) ? 0 : 1;
        up = S[row - 1][col + previousleftboundary] + 1;
        left = S[row][col - 1] + 1;
        diagonal = S[row - 1][col - (1 - previousleftboundary)] + match;
        S[row][col] = ((diagonal <= left) ? ((diagonal <= up) ? diagonal : up) : ((left <= up) ? left : up));
      }
    }
    if (rightboundary) {
      S[row][leftboundary + rowlength + rightboundary - 1] = 1000;
    }
    previousleftboundary = leftboundary;
  }
  row = len1;
  from = row - maxerr;
  to = row + maxerr;
  leftboundary = 0;
  if (from <= 0)
    from = 0;
  else
    leftboundary = 1;
  rightboundary = 0;
  if (to >= len2)
    to = len2;
  else
    rightboundary = 1;
  rowlength = to - from + 1;
  score = S[row][0];
  for (col = 1; col <= leftboundary + rowlength + rightboundary - 1; col++) {
    if (S[row][col] < score) {
      score = S[row][col];
    }
  }
  for (row = 0; row <= len1; row++) {
    free(S[row]);
  }
  free(S);
  return (score);
}
```