two functions on js/es for nodejs

You must have source code writed by you, to show me before work. task 1. * given array [{prefix:'AA'},{prefix:'AB'}] * given string for example 'ability' Create a function that generate unique pefix for given string by first letters (for 'ability' prefix will be `AB`, for 'data' prefix is 'DA'), prefix must be unique which mean it not exists in given array. - it check array and if prefix already `AB` exists it increment generated prefix and check array again until not found unique (free) prefix which is not exists in array. where increment mean AB become AC, AC become AD, ... AZ become BA, ZZ become AA like we use letters A-Z instead of digits 0-9 task 2 * given data array [{color:'AA'},{color:'AB'}], let say `data` * array of colors, let say `colors` array Create a function which: * make copy of `colors` array (using slice), let say `carray` * remove each color in `carray` if it exists in given `data` array * if `carray` is not empty return random color from it, * else return random color from `color array`, if tasks done nore we will continue work togather in future