Character Frequency in String

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Problem

Given a string s, return a mapping of each character to the number of times it appears in the string. The function should treat every character as distinct, including spaces, digits, punctuation, and differences in letter case.

Constraints

0 <= len(s) <= 10^5
s may contain letters, digits, spaces, and punctuation
The output must contain the frequency of every character present in s

Function Signature

def char_frequency(s):

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