function sayHello (string) { return `Hello, ${string}!`; }; function uppercase (string) { return string.toUpperCase(); }; function lowercase (string) { return string.toLowerCase(); }; function countCharacters (string) { return string.length; }; function firstCharacter (string) { return string[0]; }; function firstCharacters (string, n) { let newString = ""; for (let i = 0; i < n; i++) { newString += string[i]; } return newString; }; module.exports = { sayHello, uppercase, lowercase, countCharacters, firstCharacter, firstCharacters };