# 0043. Multiply Strings

<https://leetcode.com/problems/multiply-strings>

## Description

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.

## ac

```java
```


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