Kata

Background

Many programming languages offer built-in functionalities to group side-by-side identical elements. For example:

• Python: groupby function in the itertools module
• Haskell: group / groupBy function in the Data.List module
• Ruby: chunk method

So let's make one in BF!

Task

Given a null-terminated string as input, your BF program should output a string where adjacent identical characters are grouped together and enclosed in parentheses.

For the empty input "", your program should return an empty string "" since there is nothing to group.

Examples

     Input        |        Output
----------------- | --------------------
   "aaabbbccc\0" --> "(aaa)(bbb)(ccc)"
      "112211\0" --> "(11)(22)(11)"
         "xyz\0" --> "(x)(y)(z)"
            "\0" --> ""

GLHF 😉