text: const chai = require("chai");
  const assert = chai.assert;
  
  const tests = [
      [ '', "" ],
      [ '#', "" ],
      [ '##', "" ],
      [ 'abcdc', "abcdc" ],
      [ 'ab#cdc', "acdc" ],
      [ 'abc#d##c', "ac" ],
      [ 'abc####d##c#', ""  ],
  ];
  
  describe("Tests", function() {
  
      for (const [s, expected] of tests) {
          it(`input: ${s}`, function() {
              assert.strictEqual(cleanString(s), expected);
          });
      }
  
  });
  