# 1816. Truncate Sentence

https://leetcode.com/problems/truncate-sentence

## Description

A **sentence** is a list of words that are separated by a single space with no leading or trailing spaces. Each of the words consists of **only** uppercase and lowercase English letters (no punctuation).

* For example, `"Hello World"`, `"HELLO"`, and `"hello world hello world"` are all sentences.

You are given a sentence `s`​​​​​​ and an integer `k`​​​​​​. You want to **truncate** `s`​​​​​​ such that it contains only the **first** `k`​​​​​​ words. Return `s`​​​&#x200B;_&#x200B;​ after **truncating** it._

**Example 1:**

```
**Input:** s = "Hello how are you Contestant", k = 4
**Output:** "Hello how are you"
**Explanation:**
The words in s are ["Hello", "how" "are", "you", "Contestant"].
The first 4 words are ["Hello", "how", "are", "you"].
Hence, you should return "Hello how are you".
```

**Example 2:**

```
**Input:** s = "What is the solution to this problem", k = 4
**Output:** "What is the solution"
**Explanation:**
The words in s are ["What", "is" "the", "solution", "to", "this", "problem"].
The first 4 words are ["What", "is", "the", "solution"].
Hence, you should return "What is the solution".
```

**Example 3:**

```
**Input:** s = "chopper is not a tanuki", k = 5
**Output:** "chopper is not a tanuki"
```

**Constraints:**

* `1 <= s.length <= 500`
* `k` is in the range `[1, the number of words in s]`.
* `s` consist of only lowercase and uppercase English letters and spaces.
* The words in `s` are separated by a single space.
* There are no leading or trailing spaces.

## ac

```java
```
