Overlap X17922

Statement

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Write a string function max_overlap(s, t) that given two strings s and t returns the longest string that is a common prefix of s and t.

Sample session

>>> max_overlap('bugs', 'bunny')
'bu'
>>> max_overlap('winter', 'winner')
'win'
>>> max_overlap('hand', 'made')
''
>>> max_overlap('x', 'x')
'x'

Information