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) {
    const firstArr = s1.split('');
    const secondArr = s2.split('');
    let counter = 0;
  
    firstArr.forEach(currentLetter => {
      const commonLetter = secondArr.find(letter => letter === currentLetter);
      if (commonLetter) {
        counter++;
        secondArr.splice(secondArr.indexOf(commonLetter), 1);
      }
    });
  
    return counter;
  }
  