How would i create this chip in hdl (hardware description language) HiLoMux - This has one 8-bit input bus, in, and one 4-bit output bus, out. Also

How would i create this chip in hdl (hardware description language)

HiLoMux - This has one 8-bit input bus, in, and one 4-bit output bus, out. Also
present is a sel input, which is used to select what appears on out. If
sel is false, then out should contain the lower 4-bits of in (i.e. in[0],
in[1], in[2], in[3]). If sel is true, then out should contain the
upper 4-bits of in (i.e. in[4] mapped to out[0], in[5], mapped to
out[1], etc.). In other words, the HiLoMux can be used to select a
nibble from a byte…

this is what ive got so far

CHIP ALUcore

{

IN a[4], b[4], carryIn, sums, ands, xors, ors;

OUT out[4], carryOut;

PARTS:

}