Best practice to convert bit string to hex (Arduino)

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I have a string (or cstring) consisted of 24 bits "000101011110011110101110" that should be converted to hex (0x15e7ae).

As i understand bit string needs to be splitted on to 6 parts by 4 bits "0001 0101 1110 0111 1010 1110" and then each part converted to hex

0001 -> 1
0101 -> 5
1110 -> e
0111 -> 7
1010 -> a
1110 -> e

So what are the simplest and cost effective ways to convert it to hex representation: 0x15e7ae?

There is also dilemma for me which string type is better to use String or char[]. String can be easily splitted using substring function, but i don't know how to convert string type to hex.

And contrariwise char[] can be easily converted to hex using strtoul function but i didn't find simple way to split char string.

asked 20 secs ago

user947668

132

Best practice to convert bit string to hex (Arduino)