Problem 7: Double Ones (100pts)

Write a function that takes in a number and determines if the digits contain two adjacent 1s. (Reviewing Problem 4 and 5 in Lab 01 might be helpful here!)

def double_ones(n):
    """Return true if n has two ones in a row.
    
    >>> double_ones(1)
    False
    >>> double_ones(11)
    True
    >>> double_ones(2112)
    True
    >>> double_ones(110011)
    True
    >>> double_ones(12345)
    False
    >>> double_ones(10101010)
    False
    """
    "*** YOUR CODE HERE ***"