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String Compress Problem

Given a string "aaabbbccaabb", compress it, = "a3b3c2a2b2". Given that the output string's length is always smaller than the input string, you have done it in place. No extra space

Note: In this problem,
Case 1: I have considered the group length for single char as well.
Example: abb;
Output: a1b2.

Case 2: If there is any constraint with group length like if the group length is 1 then we can simply ignore the count
Example: abb
Output: ab2

In this, I have considered case 1.

Accepted Solution Criteria :
Time Complexity – O (n)
Space Complexity – O(1)

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