Repeat Last Char in Scala

Given a string s and a number n, return a new string made of the last character of s, written n times in a row.

Example 1:

Input: s = "banana", n = 3
Output: "aaa"
Explanation: The last character of "banana" is "a". Written 3 times, it gives "aaa".

Example 2:

Input: s = "Wow!", n = 2
Output: "!!"
Explanation: The last character can be any character: here it is the exclamation mark.

Example 3:

Input: s = "z", n = 1
Output: "z"
Explanation: A string of one character: its last character is "z", written once.

Constraints:

• s has at least one character and doesn't start or end with a space.
• s contains English letters, digits, spaces and punctuation.
• n is a whole number from 1 to 10.