<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _get_line(self) -> str: """Returns the current line from the file while incrementing the index."""

        line = self.in_lines[self.index]
        self.index += 1
        return line