Function fruits

calculates accuracy and rank for osu!catch / fruits / ctb

Example

    // https://osu.ppy.sh/scores/5045322123
    const hit300 = 419;
    const hit100 = 2; // drops
    const hit50 = 209; // droplets
    const hitkatu = 234 - 209; // droplet miss
    const miss = 87; // miss
    const calc = fruits(hit300, hit100, hit50, hitkatu, miss);
    /**
     * => {
     * accuracy: 84.90
     * rank: 'D'
     * }
     */
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