"""
Functions for reordering a string (incomplete)

Author: Walker M. White
Date:   September 6, 2017 (Python 3 Version)
"""


def last_name_first(s):
    """
    Returns: copy of s but in the form <last-name>, <first-name>
    
    Parameter s: a name <first-name> <last-name> 
    Precondition: s is a string <first-name> <last-name> with one
    or more blanks between the two names
    """
    # Find the first name
    first = first_name(s)
    end_first = s.find(' ')
    first_name = s[:end_first]

    # Find the last name  
    # Put them together with a comma   
    return first_name # Stub return


def last_name_first2(s):
    """
    Returns: copy of s but in the form <last-name>, <first-name>
    
    Parameter s: a name <first-name> <last-name> 
    Precondition: s is a string <first-name> <last-name> with one
    or more blanks between the two names
    """
    first = first_name(s)
    last  = last_name(s)
    return last+', '+first


def first_name(s):
    """
    Returns: First name in s
    
    Parameter s: a name <first-name> <last-name> 
    Precondition: s is a string <first-name> <last-name> with one
    or more blanks between the two names
    """
    end_first = s.find(' ')
    return s[:end_first]


def last_name(s):
    """
    Return: Last name in s
    
    Parameter s: a name <first-name> <last-name> 
    Precondition: s is a string <first-name> <last-name> with one
    or more blanks between the two names
    """
    return '' # Stub return