How to convert a hexadecimal string to a binary string in C

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It’s quite easy, really, because the translation goes digit-by-digit.

0 - 0000
1 - 0001
2 - 0010
3 - 0011
4 - 0100
5 - 0101
6 - 0110
7 - 0111
8 - 1000
9 - 1001
A - 1010
B - 1011
C - 1100
D - 1101
E - 1110
F - 1111

So, for example, the hex number FE2F8 will be 11111110001011111000 in binary

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