text: import { NotImplementedError } from '../extensions/index.js';
  
  /**
   * Given two strings, find the number of common characters between them.
   *
   * @param {String} s1
   * @param {String} s2
   * @return {Number}
   *
   * @example
   * For s1 = "aabcc" and s2 = "adcaa", the output should be 3
   * Strings have 3 common characters - 2 "a"s and 1 "c".
   */
  export default function getCommonCharacterCount(s1, s2) {
    var array = [],
        counter = 0;
  
    for (let i = 0; i < s1.length; i++) {
      array.push(s1[i]);
    }
  
    for (let k = 0; k < s2.length; k++) {
      if (array.indexOf(s2[k]) != -1) {
        counter++;
        array.splice(array.indexOf(s2[k]), 1);
      } 
    }
  
    return counter;
  }
  