user: 请从给定的汇编指令推导出C源代码：

```asm
<ngrDistance>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x18,%rsp
  movq   %xmm0,%r15
  movq   %xmm1,%r14
  mov    %rdi,%rbp
  mov    %rsi,0x8(%rsp)
  mov    %rdx,%r12
  mov    $0x31,%esi
  lea    D7(%rip),%rdi
  mov    $0x2,%eax
  call   <printf@plt>
  lea    D35(%rip),%rbx
  mov    $0x0,%r13d
L27:
  mov    $0x4b,%edi
  movsd  0x8(%rbx),%xmm3
  movsd  (%rbx),%xmm2
  movq   %r14,%xmm1
  movq   %r15,%xmm0
  call   <geoDistance@plt>
  cmp    $0x3b,%eax
  jle    L15
  add    $0x1,%r13d
  add    $0x38,%rbx
  cmp    $0x31,%r13d
  jne    L27
  lea    D36(%rip),%rdi
  call   <puts@plt>
  pxor   %xmm0,%xmm0
  jmp    L28
L15:
  movslq %r13d,%r13
  lea    0x0(,%r13,8),%rbx
  sub    %r13,%rbx
  shl    $0x3,%rbx
  lea    D49(%rip),%r13
  lea    0x5(%r13,%rbx,1),%r14
  lea    (%rbx,%r13,1),%r15
  mov    %r14,%rdx
  mov    %r15,%rsi
  lea    D13(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    %r15,%rsi
  mov    %r12,%rdi
  call   <strcpy@plt>
  mov    %r14,%rsi
  mov    %rbp,%rdi
  call   <strcpy@plt>
  lea    0x17(%r13,%rbx,1),%rsi
  mov    0x8(%rsp),%rdi
  call   <strcpy@plt>
  movsd  D3(%rip),%xmm0
L28:
  add    $0x18,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

tool_calls: name: unpack_data
arguments: label: D7
type: string
name: unpack_data
arguments: label: D36
type: string
name: unpack_data
arguments: label: D13
type: string
name: unpack_data
arguments: label: D3
type: byte[8]

tool: D7: The size of ngrLookup is %ld, lat %f, long %f 


tool: D36: Location not found

tool: D13: You are located in square %s located in %s


tool: {"D3": [0x00,0x00,0x00,0x00,0x00,0x00,0xf0,0x3f]}

assistant: ```c
double ngrDistance(double lat, double lng, char *country1, char *country2, char *ngr) {
  uint16_t i;
  static struct ngrLookupStruct {
    char ngr[5];
    char country1[18];
    char country2[10];
    double lat;
    double lon;
  } ngrLookup[] = {{"SV", "England", "", 50.246, -6.911}, {"SW", "England", "", 50.297, -5.511}, {"SX", "England", "", 50.330, -4.109}, {"SY", "England", "", 50.348, -2.704}, {"SZ", "England", "", 50.348, -1.3}, {"TV", "England", "", 50.331, 0.106}, {"SR", "Wales", "", 51.194388, -5.579542}, {"SS", "England", "Wales", 51.229421, -4.149717}, {"ST", "England", "Wales", 51.246969, -2.717735}, {"SU", "England", "", 51.246989, -1.285031}, {"TQ", "England", "", 51.229482, 0.146955}, {"TR", "England", "", 51.194489, 1.576786}, {"SM", "Wales", "", 52.091722, -5.651005}, {"SN", "Wales", "", 52.127894, -4.192711}, {"SO", "England", "Wales", 52.146013, -2.732105}, {"SP", "England", "", 52.146034, -1.270726}, {"TL", "England", "", 53.026267, 0.235122}, {"TM", "England", "", 52.091825, 1.648184}, {"SH", "Wales", "", 53.026202, -4.238019}, {"SJ", "England", "Wales", 53.044916, -2.747250}, {"SK", "England", "", 53.044937, -1.255651}, {"TF", "England", "", 53.026267, 0.235122}, {"TG", "England", "", 52.988951, 1.723418}, {"SC", "England", "", 53.924346, -4.285810}, {"SD", "England", "", 53.943679, -2.763226}, {"SE", "England", "", 53.943701, -1.239749}, {"TA", "England", "", 54.782439, -5.889575}, {"NW", "Northern_Ireland", "", 54.782439, -5.889575}, {"NX", "England", "Scotland", 54.822323, -4.336271}, {"NY", "England", "Scotland", 54.842304, -2.780095}, {"NZ", "England", "Scotland", 54.842327, -1.222957}, {"OV", "England", "", 54.822392, 0.333224}, {"NR", "Scotland", "", 55.678902, -5.978189}, {"NS", "Scotland", "", 55.720134, -4.389608}, {"NT", "Scotland", "", 55.740791, -2.797926}, {"NU", "Scotland", "", 55.740815, -1.205207}, {"NL", "Scotland", "", 56.511336, -7.692291}, {"NM", "Scotland", "", 56.575134, -6.071947}, {"NN", "Scotland", "", 56.617777, -4.446048}, {"NO", "Scotland", "", 56.639142, -2.816797}, {"NF", "Scotland", "", 57.405124, -7.830669}, {"NG", "Scotland", "", 57.471129, -6.171267}, {"NH", "Scotland", "", 57.515251, -4.505847}, {"NJ", "Scotland", "", 57.537358, -2.836792}, {"NK", "Scotland", "", 57.537383, -1.166519}, {"NA", "Scotland", "", 58.298558, -7.977409}, {"NB", "Scotland", "", 58.366878, -6.276616}, {"NC", "Scotland", "", 58.412554, -4.569285}, {"ND", "Scotland", "", 58.435441, -2.858005}};
  printf("The size of ngrLookup is %ld, lat %f, long %f \n", sizeof(ngrLookup) / sizeof(ngrLookup[0]), lat, lng);
  for (i = 0; i < sizeof(ngrLookup) / sizeof(ngrLookup[0]); i++) {
    if (geoDistance(lat, lng, ngrLookup[i].lat, ngrLookup[i].lon, 'K') < 60) {
      printf("You are located in square %s located in %s\n", ngrLookup[i].ngr, ngrLookup[i].country1);
      strcpy(ngr, ngrLookup[i].ngr);
      strcpy(country1, ngrLookup[i].country1);
      strcpy(country2, ngrLookup[i].country2);
      return 1;
    }
  }
  printf("Location not found\n");
  return 0;
}
```