user: Translate the below assembly code into C programming language:

```asm
<count_pairs>:
  endbr64
  mov    %esi,%r8d
  mov    %edx,%esi
  mov    %ecx,%edx
  cmp    %ecx,%r8d
  jle    L189
  mov    %r8d,%r11d
  sub    %ecx,%r11d
  lea    -0x1(%r11),%eax
  cmp    $0xe,%eax
  jbe    L8
  movslq %ecx,%r9
  mov    %r11d,%ecx
  movslq %esi,%r10
  xor    %eax,%eax
  shr    $0x4,%ecx
  add    %rdi,%r10
  pxor   %xmm1,%xmm1
  add    %rdi,%r9
  movdqa D9(%rip),%xmm6
  shl    $0x4,%rcx
  pxor   %xmm5,%xmm5
  pxor   %xmm4,%xmm4
  nopl   0x0(%rax,%rax,1)
L142:
  movdqu (%r9,%rax,1),%xmm7
  movdqu (%r10,%rax,1),%xmm0
  movdqa %xmm5,%xmm3
  add    $0x10,%rax
  pcmpeqb %xmm7,%xmm0
  pand   %xmm6,%xmm0
  pcmpgtb %xmm0,%xmm3
  movdqa %xmm0,%xmm2
  punpcklbw %xmm3,%xmm2
  punpckhbw %xmm3,%xmm0
  movdqa %xmm4,%xmm3
  pcmpgtw %xmm2,%xmm3
  movdqa %xmm2,%xmm7
  punpcklwd %xmm3,%xmm7
  punpckhwd %xmm3,%xmm2
  movdqa %xmm0,%xmm3
  paddd  %xmm7,%xmm1
  paddd  %xmm2,%xmm1
  movdqa %xmm4,%xmm2
  pcmpgtw %xmm0,%xmm2
  punpcklwd %xmm2,%xmm3
  punpckhwd %xmm2,%xmm0
  paddd  %xmm3,%xmm1
  paddd  %xmm0,%xmm1
  cmp    %rcx,%rax
  jne    L142
  movdqa %xmm1,%xmm0
  mov    %r11d,%ecx
  psrldq $0x8,%xmm0
  and    $0xfffffff0,%ecx
  paddd  %xmm0,%xmm1
  add    %ecx,%edx
  add    %ecx,%esi
  movdqa %xmm1,%xmm0
  psrldq $0x4,%xmm0
  paddd  %xmm0,%xmm1
  movd   %xmm1,%eax
  cmp    %ecx,%r11d
  je     L46
L93:
  movslq %esi,%r9
  lea    0x1(%rdx),%ecx
  lea    0x1(%rsi),%r10d
  movslq %edx,%r11
  movzbl (%rdi,%r11,1),%r11d
  cmp    %r11b,(%rdi,%r9,1)
  sete   %r9b
  movzbl %r9b,%r9d
  add    %r9d,%eax
  cmp    %r8d,%ecx
  jge    L117
  movslq %r10d,%r10
  lea    0x2(%rdx),%r9d
  lea    0x2(%rsi),%r11d
  movslq %ecx,%rcx
  movzbl (%rdi,%rcx,1),%ecx
  cmp    %cl,(%rdi,%r10,1)
  sete   %cl
  movzbl %cl,%ecx
  add    %ecx,%eax
  cmp    %r9d,%r8d
  jle    L117
  movslq %r11d,%r11
  lea    0x3(%rdx),%ecx
  lea    0x3(%rsi),%r10d
  movslq %r9d,%r9
  movzbl (%rdi,%r9,1),%r9d
  cmp    %r9b,(%rdi,%r11,1)
  sete   %r9b
  movzbl %r9b,%r9d
  add    %r9d,%eax
  cmp    %ecx,%r8d
  jle    L117
  movslq %r10d,%r10
  lea    0x4(%rdx),%r9d
  lea    0x4(%rsi),%r11d
  movslq %ecx,%rcx
  movzbl (%rdi,%rcx,1),%ecx
  cmp    %cl,(%rdi,%r10,1)
  sete   %cl
  movzbl %cl,%ecx
  add    %ecx,%eax
  cmp    %r9d,%r8d
  jle    L117
  movslq %r11d,%r11
  lea    0x5(%rdx),%ecx
  lea    0x5(%rsi),%r10d
  movslq %r9d,%r9
  movzbl (%rdi,%r9,1),%r9d
  cmp    %r9b,(%rdi,%r11,1)
  sete   %r9b
  movzbl %r9b,%r9d
  add    %r9d,%eax
  cmp    %ecx,%r8d
  jle    L117
  movslq %r10d,%r10
  lea    0x6(%rdx),%r9d
  lea    0x6(%rsi),%r11d
  movslq %ecx,%rcx
  movzbl (%rdi,%rcx,1),%ecx
  cmp    %cl,(%rdi,%r10,1)
  sete   %cl
  movzbl %cl,%ecx
  add    %ecx,%eax
  cmp    %r9d,%r8d
  jle    L117
  movslq %r11d,%r11
  lea    0x7(%rdx),%ecx
  lea    0x7(%rsi),%r10d
  movslq %r9d,%r9
  movzbl (%rdi,%r9,1),%r9d
  cmp    %r9b,(%rdi,%r11,1)
  sete   %r9b
  movzbl %r9b,%r9d
  add    %r9d,%eax
  cmp    %ecx,%r8d
  jle    L117
  movslq %r10d,%r10
  lea    0x8(%rdx),%r9d
  lea    0x8(%rsi),%r11d
  movslq %ecx,%rcx
  movzbl (%rdi,%rcx,1),%ecx
  cmp    %cl,(%rdi,%r10,1)
  sete   %cl
  movzbl %cl,%ecx
  add    %ecx,%eax
  cmp    %r9d,%r8d
  jle    L117
  movslq %r11d,%r11
  lea    0x9(%rdx),%ecx
  lea    0x9(%rsi),%r10d
  movslq %r9d,%r9
  movzbl (%rdi,%r9,1),%r9d
  cmp    %r9b,(%rdi,%r11,1)
  sete   %r9b
  movzbl %r9b,%r9d
  add    %r9d,%eax
  cmp    %ecx,%r8d
  jle    L117
  movslq %r10d,%r10
  lea    0xa(%rdx),%r9d
  lea    0xa(%rsi),%r11d
  movslq %ecx,%rcx
  movzbl (%rdi,%rcx,1),%ecx
  cmp    %cl,(%rdi,%r10,1)
  sete   %cl
  movzbl %cl,%ecx
  add    %ecx,%eax
  cmp    %r9d,%r8d
  jle    L117
  movslq %r11d,%r11
  lea    0xb(%rdx),%ecx
  lea    0xb(%rsi),%r10d
  movslq %r9d,%r9
  movzbl (%rdi,%r9,1),%r9d
  cmp    %r9b,(%rdi,%r11,1)
  sete   %r9b
  movzbl %r9b,%r9d
  add    %r9d,%eax
  cmp    %ecx,%r8d
  jle    L117
  movslq %r10d,%r10
  lea    0xc(%rdx),%r9d
  lea    0xc(%rsi),%r11d
  movslq %ecx,%rcx
  movzbl (%rdi,%rcx,1),%ecx
  cmp    %cl,(%rdi,%r10,1)
  sete   %cl
  movzbl %cl,%ecx
  add    %ecx,%eax
  cmp    %r9d,%r8d
  jle    L117
  movslq %r11d,%r11
  lea    0xd(%rdx),%ecx
  lea    0xd(%rsi),%r10d
  movslq %r9d,%r9
  movzbl (%rdi,%r9,1),%r9d
  cmp    %r9b,(%rdi,%r11,1)
  sete   %r9b
  movzbl %r9b,%r9d
  add    %r9d,%eax
  cmp    %ecx,%r8d
  jle    L117
  movslq %r10d,%r10
  movslq %ecx,%rcx
  add    $0xe,%edx
  add    $0xe,%esi
  movzbl (%rdi,%rcx,1),%ecx
  cmp    %cl,(%rdi,%r10,1)
  sete   %cl
  movzbl %cl,%ecx
  add    %ecx,%eax
  cmp    %edx,%r8d
  jle    L117
  movslq %esi,%rsi
  movslq %edx,%rdx
  movzbl (%rdi,%rdx,1),%edx
  cmp    %dl,(%rdi,%rsi,1)
  sete   %dl
  movzbl %dl,%edx
  add    %edx,%eax
  ret
  nopl   0x0(%rax)
L117:
  ret
  nopl   0x0(%rax)
L189:
  xor    %eax,%eax
  ret
L8:
  xor    %eax,%eax
  jmp    L93
L46:
  ret
```

tool_calls: name: unpack_data
arguments: data_label: D9
datatype: byte[16]

tool: {"D9": [0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01]}

assistant: ```c
int count_pairs(char *str, int len, int start, int end) {
  if (end >= len) {
    return 0;
  } else {
    if (str[start] == str[end]) {
      return 1 + count_pairs(str, len, start + 1, end + 1);
    } else {
      return 0 + count_pairs(str, len, start + 1, end + 1);
    }
  }
}
```