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Given a string containing of ‘**0**’, ‘**1**’ and ‘**?**’ - a wildcard character, generate all distinct **binary strings** that can be formed by replacing each wildcard character by either ‘**0**’ or ‘**1**’.

**Example 1:**

**Input: **1??0?101
**Output: **10000101 10001101 10100101 10101101
11000101 11001101 11100101 11101101
**Explanation:
**There will be 8 such possible strings that
can be formed, they are 10000101, 10001101,
10100101, 10101101, 11000101, 11001101,
11100101 and 11101101.

**Example 2:**

Input:10?Output:100 101Explanation:There are 2 such possible strings and they are 100 and 101.

**Your Task:**

You don't need to read or print anything. Your task is to complete the function **generate_binary_string() **which takes the given string as input parameter and returns a vector of strings containing all the possible strings that can be formed.

**Expected Time complexity: **O(2^{n})

**Expected Space complexity: **O(n*2^{n})

**Constraints:**

1 ≤ length of string ≤ 30

**Note:** Number of '**?**' in any string does not exceed 15.

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Generate binary string

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