67. Add Binary

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67. Add Binary

Given two binary strings a and b, return their sum as a binary string.

Examples

Example 1:

Input: a = "11", b = "1"
Output: "100"

Example 2:

Input: a = "1010", b = "1011"
Output: "10101"

Constraints

• 1 <= a.length, b.length <= 104
• a and b consists only of '0' or '1' characters.
• Each string does not contain leading zeros except for the zero itself.