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Teste de "syntax highlighting"

Teste de "syntax highlighting":

```
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>

#define KNOWN_GARBAGE ((int*)~0u)

int main (void)
{
  int* ptr = KNOWN_GARBAGE;
  ptr = malloc(0);
  int errno_changed = errno;

  if(ptr == NULL)
    puts("Returned NULL.");
  else if(ptr == KNOWN_GARBAGE)
    puts("Didn't modify the pointer, non-conforming?");
  else
    puts("Returned non-zero, modified the pointer.");
  if(errno_changed)
    printf("Weird use of errno detected, error code 0x%X\n", errno_changed);
}
```

copiado de: https://software.codidact.com/posts/292694