write me a function `stringy` that takes a `size` and returns a `string` of alternating `'1s'` and `'0s'`.
the string should start with a `1`.
a string with `size` 6 should return :`'101010'`.
with `size` 4 should return : `'1010'`.
with `size` 12 should return : `'101010101010'`.
The size will always be positive and will only use whole numbers.
def stringy(size):
    return ('1' * size).replace('11', '10')
    
# def stringy(size):
#  return '10' * (size / 2) + '1' * (size % 2)

# def stringy(size):
#    return __import__('re').sub('11', '10', '1' * size)

def stringy(size):
    return ('1' * size).replace('11', '10')
    
# def stringy(size):
#  return '10' * (size / 2) + '1' * (size % 2)

# def stringy(size):
#    return __import__('re').sub('11', '10', '1' * size)
