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Multiply Strings
Difficulty: Medium
Category: DSA
Topics: Math, String, Simulation
Asked at: Facebook, Microsoft, Amazon, Square, Apple, Bloomberg, Two Sigma, ByteDance
Given two non-negative integers `num1` and `num2` represented as strings, return the product of `num1` and `num2`, also represented as a string.
**Note:** You must not use any built-in BigInteger library or convert the inputs to integer directly.
**Example 1:**
**Input:** num1 = "2", num2 = "3"
**Output:** "6"
```
**Example 2:**
**Input:** num1 = "123", num2 = "456"
**Output:** "56088"
```
**Constraints:**
- `1 <= num1.length, num2.length <= 200`
- `num1` and `num2` consist of digits only.
- Both `num1` and `num2` do not contain any leading zero, except the number `0` itself.
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