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) {
    let res = 0;
    const one = s1.split('');
    const two = s2.split('');
    for (let i = 0; i < one.length; i++) {
      if (two.indexOf(one[i]) !== -1) {
        res++;
        two.splice(two.indexOf(one[i]), 1);
      }
    }
    return res;
  }
  