Recurring Character
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Given a string, write a function recurring_char
to find its first recurring character. Return None
if there is no recurring character.
Treat upper and lower case letters as distinct characters.
You may assume the input string includes no spaces.
Example 1:
Input:
input = "interviewquery"
Output:
output = "i"
Example 2:
Input:
input = "interv"
Output:
output = None
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