code: def prepare_full_example_1() -> None:
      
      testtools.TestIO.clear()
      shutil.copytree(
          os.path.join(data.__path__[0], 'LahnH'),
          os.path.join(iotesting.__path__[0], 'LahnH'))
      seqpath = os.path.join(iotesting.__path__[0], 'LahnH', 'series')
      for folder in ('output', 'node', 'temp'):
          os.makedirs(os.path.join(seqpath, folder))
docs: Prepare the complete `LahnH` project for testing.
  
      >>> from hydpy.core.examples import prepare_full_example_1
      >>> prepare_full_example_1()
      >>> from hydpy import TestIO
      >>> import os
      >>> with TestIO():
      ...     print('root:', *sorted(os.listdir('.')))
      ...     for folder in ('control', 'conditions', 'series'):
      ...         print(f'LahnH/{folder}:',
      ...               *sorted(os.listdir(f'LahnH/{folder}')))
      root: LahnH __init__.py
      LahnH/control: default
      LahnH/conditions: init_1996_01_01
      LahnH/series: input node output temp
  
      ToDo: Improve, test, and explain this example data set.