1816 - Truncate Sentence.

Easy

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_ 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.