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i have problem with change srting to array

my string input is like this B109DAE1B71B638E it come from Serial.readString

and i want to change this string to array byte like this

byte in01[] = { 0xB1, 0x09, 0xDA, 0xE1, 0xB7, 0x1B, 0x63, 0x8E };

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