def _build_line(entry):
    """
    Create a define statement in a single line.
    Args:
        - entry(Dictionary(String:String)): Dictionary containing a description
          of the target define statement using the Keys: 'Module',
          'Address/Value', 'Function', 'Submodule' (opt), 'Comment' (opt)
    Returns:
        - (String): Define statement of the form:
          #define Module_Submodule_Function Address/Value // Comment
    """
    line = '#define '
    line += '{}_'.format(entry['Module'])
    if entry['Submodule']:
        line += '{}_'.format(entry['Submodule'])
    line += entry['Function']
    line += ' {} '.format(entry['Address/Value'])
    if entry['Comment']:
        line += '// {}'.format(entry['Comment'])
    line += '\n'
    return line