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hackerrank.com Standardize Mobile Number Using Decorators Problem Link : https://www.hackerrank.com/challenges/standardize-mobile-number-using-decorators/problem Difficulty : Easy Tip Use reverse index to substring aaaaa and bbbb from +91 aaaaa aaaaa Like aaaaa is s[-10:-5] and s[-5:0] Should uderstand how decorator work in python, it is a bit difficult Please understand how to use decorator, th..