to delete the '\0' characters

[Salih Dincer via Digitalmars-d-learn]

Is there a more accurate way to delete the '\0' characters at the 
end of the string? I tried functions in this module: 
https://dlang.org/phobos/std_string.html

```d
auto foo(string s)
{
  string r;
  foreach(c; s)
  {
    if(c > 0)
    {
      r ~= c;
    }
  }
  return r;
}
```
SDB@79