Write the code for the following function. """ def unmask_chars(s1: str, s2: str, mask: str) -> str: ''' Return a new string where the character at index i is s1[i] if mask[i] is 0 and s2[i] if mask[i] is 1.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Q3: Writing a Function

Write the code for the following function.
"""

def unmask_chars(s1: str, s2: str, mask: str) -> str:
'''
Return a new string where the character at index i is
s1[i] if mask[i] is 0
and s2[i] if mask[i] is 1.

len(s1), len(s2), and len(mask) are equal.

>>> unmask_chars('cat', 'bat', '001')
'cat'
>>> unmask_chars('a', 'b', '0')
'a'
>>> unmask_chars('apple', 'graph', '01011')
'arpph'

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