Below is a permutation function written in C. It takes eight bytes as input represented as an array of two unsigned ints and puts the result back into the same array. Write its inverse using the below function header.

void permute(unsigned blk[2]) {

blk[0] = blk[0] ^ ((blk[1] << 1) + blk[1]);

blk[1] = blk[1] ^ ((blk[0] << 1) + blk[0]);

}

void inverse_permute(unsigned blk[2]) {