function hackerrankInString(s: string): string {
    /**
     * idea is simple
     * 
     * 1. create 2 array of 'hackerrank' and 's' that hold it characters
     * 2. loop ...
     *      reduce [s]
     *      reduce [hackerrank] too if both starting element is same
     *      if [hackerrank] empty first, go 'YES'
     *      if [s] empty first, go 'NO
     */

    let _h = 'hackerrank'.split('')
    let _s = s.split('')

    while (true) {
        if (_h.length == 0) return 'YES'
        if (_s.length == 0) return 'NO'

        _s[0] == _h[0] && _h.shift()
        _s.shift()
    }
}