function search (text, keyword) {
  let start = 0

  text = text.toLowerCase()
  keyword = keyword.toLowerCase()

  for (let i = 0; i < keyword.length; ++i) {
    const char = keyword[i]
    const index = text.indexOf(char, start)

    if (index < 0) {
      return false
    }

    start = index + 1
  }

  return true
}