Goal

The goal of this Kata is to implement to_chemical which will make some letters in a name uppercase such that it represents valid chemical symbols. We only consider chemical symbols which are either 1 or 2 characters long.

The input name will be a lowercase String and the output should also be a String.

A Set of valid chemical symbols called CHEM_SYMBOLS is preloaded.

Note: Sometimes there may be several correct answers, just return one of them.

Examples

to_chemical("") => ""

to_chemical("admiraal") => ""

"A or Ad are not valid symbols"

to_chemical("codewars") => "C" + "O" + ... => ""

"`C` and `O` are valid but 'D' or `Od` or `De` are not valid symbols"

to_chemical("nam") => "Na" + .. => "N" + "Am" => "NAm"

to_chemical("namo") => "N" + "Am" + "O" => "NAmO"  or  "Na" + "Mo" => "NaMo"

to_chemical("dsb") => "Ds" + "B" => "DsB"

to_chemical("hiphop") => "H" + "I" + "P" + "H" + "O" + "P" => "HIPHOP"  or  "H" + "I" + "P" + "Ho" + "P" => "HIPHoP"

to_chemical("baga") => "B" + "Ag" + .. => "Ba" + "Ga" => "BaGa"