Remove Consecutive Characters | InterviewBit | Solution

Note: If you want a detailed explanation, here you go: Remove Consecutive Characters | InterviewBit | Solution Explained.

class Solution:
    def solve(self, s, k):
        a = ["."]

        for c in s:
            if a[-1][0] == c:
                a[-1] += c
        a = a[1:]
        ns = ""
        for temp in a:
            final_len = len(temp)%k
            ns += temp[0]*final_len
        return ns
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    1. Please write the proof.

    2. This solution need an amendment for 2 digit number.

    3. Please write a Proof for this

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