ex04.js

function capitalize(str = '', restToLoweropt = false) {
    let sentence = ''
  
    for (let i = 0; i < str.length; i++) {
      if (i === 0 && str.charCodeAt(0) >= 97 && str.charCodeAt(0) <= 122) {
        sentence += String.fromCharCode(str.charCodeAt(0) - 32)
      } else if (i !== 0 && restToLoweropt && str.charCodeAt(i) >= 65 && str.charCodeAt(i) <= 90) {
        sentence += String.fromCharCode(str.charCodeAt(i) + 32)
      } else {
        sentence += str[i]
      }
    }
  
    return sentence
  }
  
  console.log(capitalize('one Code'))
  console.log(capitalize('One CODE', true))