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Given two binary strings, return their sum (also a binary string).
The input strings are both non-empty and contains only characters 1 or 0.
Example 1:
Input: a = "11", b = "1" Output: "100"
Example 2:
Input: a = "1010", b = "1011" Output: "10101"
Constraints:
- Each string consists only of
'0'or'1'characters. 1 <= a.length, b.length <= 10^4- Each string is either
"0"or doesn't contain any leading zero.