Overlap X17922

Statement

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