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 counter = 0;
    let testStr = str2;
    for (let i = 0; i < str1.length; i++) {
      const index = testStr.indexOf(str1[i]);
      if (index !== -1) {
        testStr = testStr.substr(0, index) + testStr.substr(index + 1);
        counter++;
      }
    }
    return counter;
  }
  