From given string input can we make Palindrome or not

PalindromePermutation.scala

import scala.annotation.tailrec

/**
  * From given string input can we make Palindrome or not
  * Input: Tact Coa
  * Output: True 
  * (permutations: "taco cat". "atco cta". etc.)
  * Created by Arun Sethia on 7/6/18.
  */
trait PalindromePermutation {

  /**
    * remove trail space O(n+n)=O(2n)
    *
    * @param in
    * @return
    */
  private def removeSpaceAndLowerCase(in: String): List[Char] = {
    in.toList.foldLeft(new StringBuilder)(
      (s, c) => if (c != ' ') s.append(c.toLower) else s)
      .toList
  }

  /**
    * Permute Palindrome is possible
    *
    * @param in
    */
  def canPermutePalindrome(in: String): Boolean = {
    val charCount: Array[Int] = Array.ofDim[Int](128)
    @tailrec
    def isPossible(chars: List[Char], count: Int): Int = {
      chars match {
        case Nil => count
        case h :: t => {
          val charInt = h.toInt
          charCount(charInt) = charCount(charInt) + 1
          val evenOddCount = if (charCount(charInt) % 2 == 0) count - 1 else count + 1
          isPossible(t, evenOddCount)
        }
      }
    }
    isPossible(removeSpaceAndLowerCase(in), 0) <= 1
  }


}