code: public function unquoteSimpleColumnName($name)
      {
          if (is_string($this->columnQuoteCharacter)) {
              $startingCharacter = $this->columnQuoteCharacter;
          } else {
              $startingCharacter = $this->columnQuoteCharacter[0];
          }
          return strpos($name, $startingCharacter) === false ? $name : substr($name, 1, -1);
      }
docs: Unquotes a simple column name.
  A simple column name should contain the column name only without any prefix.
  If the column name is not quoted or is the asterisk character '*', this method will do nothing.
  @param string $name column name.
  @return string unquoted column name.
  @since 2.0.14