void trim_leading(char *str) {
  char *i = str;
  char *j = str;

  while(*j != 0)
    if(*++j != ' ') break;

  while(*j != 0)
    *i++ = *j++;

  *i = 0;
}

void trim_multi(char *str) {
  char *i = str;
  char *j = str;

  while(*j != 0) {
    *i = *j++;

    if(
      (*j != ' ') ||
      (*j == ' ' && *(j - 1) != ' ')
    ) i++;
  }

  *i = 0;
}