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

```asm
<nextStep>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x20,%rsp
  mov    %rdi,-0x18(%rbp)
  mov    %esi,-0x1c(%rbp)
  mov    %edx,-0x20(%rbp)
  movl   $0x0,-0x10(%rbp)
  movl   $0x0,-0xc(%rbp)
  movl   $0x0,-0x8(%rbp)
  movl   $0x0,-0x4(%rbp)
  mov    -0x20(%rbp),%eax
  add    $0x1,%eax
  cltd
  shr    $0x1f,%edx
  add    %edx,%eax
  and    $0x1,%eax
  sub    %edx,%eax
  mov    %eax,-0x4(%rbp)
  movl   $0x0,-0x10(%rbp)
  jmp    L99
L95:
  movl   $0x0,-0xc(%rbp)
  jmp    L74
L62:
  mov    -0x20(%rbp),%eax
  cltq
  imul   $0x2710,%rax,%rdx
  mov    -0x18(%rbp),%rax
  lea    (%rdx,%rax,1),%rdi
  mov    -0xc(%rbp),%ecx
  mov    -0x10(%rbp),%edx
  mov    -0x1c(%rbp),%eax
  mov    %eax,%esi
  call   <numberOfNeighbors@plt>
  mov    %eax,-0x8(%rbp)
  mov    -0x20(%rbp),%eax
  cltq
  imul   $0x2710,%rax,%rdx
  mov    -0x18(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0xc(%rbp),%eax
  movslq %eax,%rsi
  mov    -0x10(%rbp),%eax
  movslq %eax,%rdx
  mov    %rdx,%rax
  shl    $0x2,%rax
  add    %rdx,%rax
  lea    0x0(,%rax,4),%rdx
  add    %rdx,%rax
  add    %rax,%rax
  add    %rsi,%rax
  mov    (%rcx,%rax,4),%eax
  cmp    $0x1,%eax
  jne    L67
  cmpl   $0x1,-0x8(%rbp)
  jg     L66
  mov    -0x4(%rbp),%eax
  cltq
  imul   $0x2710,%rax,%rdx
  mov    -0x18(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0xc(%rbp),%eax
  movslq %eax,%rsi
  mov    -0x10(%rbp),%eax
  movslq %eax,%rdx
  mov    %rdx,%rax
  shl    $0x2,%rax
  add    %rdx,%rax
  lea    0x0(,%rax,4),%rdx
  add    %rdx,%rax
  add    %rax,%rax
  add    %rsi,%rax
  movl   $0x0,(%rcx,%rax,4)
  jmp    L69
L66:
  cmpl   $0x3,-0x8(%rbp)
  jle    L6
  mov    -0x4(%rbp),%eax
  cltq
  imul   $0x2710,%rax,%rdx
  mov    -0x18(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0xc(%rbp),%eax
  movslq %eax,%rsi
  mov    -0x10(%rbp),%eax
  movslq %eax,%rdx
  mov    %rdx,%rax
  shl    $0x2,%rax
  add    %rdx,%rax
  lea    0x0(,%rax,4),%rdx
  add    %rdx,%rax
  add    %rax,%rax
  add    %rsi,%rax
  movl   $0x0,(%rcx,%rax,4)
  jmp    L69
L6:
  mov    -0x4(%rbp),%eax
  cltq
  imul   $0x2710,%rax,%rdx
  mov    -0x18(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0xc(%rbp),%eax
  movslq %eax,%rsi
  mov    -0x10(%rbp),%eax
  movslq %eax,%rdx
  mov    %rdx,%rax
  shl    $0x2,%rax
  add    %rdx,%rax
  lea    0x0(,%rax,4),%rdx
  add    %rdx,%rax
  add    %rax,%rax
  add    %rsi,%rax
  movl   $0x1,(%rcx,%rax,4)
  jmp    L69
L67:
  cmpl   $0x3,-0x8(%rbp)
  jne    L76
  mov    -0x4(%rbp),%eax
  cltq
  imul   $0x2710,%rax,%rdx
  mov    -0x18(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0xc(%rbp),%eax
  movslq %eax,%rsi
  mov    -0x10(%rbp),%eax
  movslq %eax,%rdx
  mov    %rdx,%rax
  shl    $0x2,%rax
  add    %rdx,%rax
  lea    0x0(,%rax,4),%rdx
  add    %rdx,%rax
  add    %rax,%rax
  add    %rsi,%rax
  movl   $0x1,(%rcx,%rax,4)
  jmp    L69
L76:
  mov    -0x4(%rbp),%eax
  cltq
  imul   $0x2710,%rax,%rdx
  mov    -0x18(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0xc(%rbp),%eax
  movslq %eax,%rsi
  mov    -0x10(%rbp),%eax
  movslq %eax,%rdx
  mov    %rdx,%rax
  shl    $0x2,%rax
  add    %rdx,%rax
  lea    0x0(,%rax,4),%rdx
  add    %rdx,%rax
  add    %rax,%rax
  add    %rsi,%rax
  movl   $0x0,(%rcx,%rax,4)
L69:
  addl   $0x1,-0xc(%rbp)
L74:
  mov    -0xc(%rbp),%eax
  cmp    -0x1c(%rbp),%eax
  jl     L62
  addl   $0x1,-0x10(%rbp)
L99:
  mov    -0x10(%rbp),%eax
  cmp    -0x1c(%rbp),%eax
  jl     L95
  nop
  nop
  leave
  ret
```

assistant: ```c
void nextStep(int gamePlane[2][50][50], int size, int currentPlane) {
  int i = 0, j = 0, neighbors = 0, nextPlane = 0;
  nextPlane = (currentPlane + 1) % 2;
  for (i = 0; i < size; i++) {
    for (j = 0; j < size; j++) {
      neighbors = numberOfNeighbors(gamePlane[currentPlane], size, i, j);
      if (gamePlane[currentPlane][i][j] == 1) {
        if (neighbors < 2) {
          gamePlane[nextPlane][i][j] = 0;
        } else if (neighbors > 3) {
          gamePlane[nextPlane][i][j] = 0;
        } else {
          gamePlane[nextPlane][i][j] = 1;
        }
      } else {
        if (neighbors == 3) {
          gamePlane[nextPlane][i][j] = 1;
        } else {
          gamePlane[nextPlane][i][j] = 0;
        }
      }
    }
  }
}
```