Given a number x and two digits d1 and d2, replace d1 with d2 in x.
Input : x = 645, d1 = 6, d2 = 5 Output : 545 We replace digit 6 with 5 in number 645. Input : x = 746, d1 = 7, d2 = 8 Output : 846
We traverse through all digits of x. For every digit, we check if it is d1, we update result accordingly.
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