text: 'use strict';
  
  /*
   * Create a `keepFirst` function that takes a string as parameter
   * and return the string only keeping the 2 first characters
   *
   * Create a `keepLast` function that takes a string as parameter
   * and return the string only keeping the 2 last characters
   *
   * Create a `keepFirstLast` function that takes a string as parameter
   * and only keep 2 characters from the third character
   *
   */
  
  // Your code:
  const keepFirst = (s) => {
      return s.substring(0, 2)
  }
  
  const keepLast = (s) => {
      return s.slice(5)
  }
  
  const keepFirstLast = (s) => {
          return s.substring(2, 4)
      }
      //* Begin of tests
  const assert = require('assert');
  
  //assert.fail('You must write your own tests');
  assert.strictEqual(typeof keepFirst, 'function');
  assert.strictEqual(typeof keepLast, 'function');
  assert.strictEqual(typeof keepFirstLast, 'function');
  assert.strictEqual(keepFirst('hello'), 'he');
  assert.strictEqual(keepLast('goodbye'), 'ye');
  assert.strictEqual(keepFirstLast('amazing'), 'az');
  // End of tests */