Update binary_coded_decimal.py

Author: cclauss

bit_manipulation/binary_coded_decimal.py

@@ -18,8 +18,6 @@ def binary_coded_decimal(number: int) -> str:
     >>> binary_coded_decimal(987)
     '0b100110000111'
     """
-    if number < 0:
-        return "0b0000"
     return "0b" + "".join(str(bin(int(digit)))[2:].zfill(4) for digit in str(max(0, number)))