Oh, yeah, I thought 1 digit could only move 1 place, makes sense, my mind went completly blank. Thank you

how is the 0 bigger than 8

That's exactly why your answer isn't correct. There are smaller numbers that are bigger than initial number. 1234567890 < 1234567908 < 1234567980.

Maybe you misunderstood the task, but the clue is in the title.

I think tests are broken on golang, I pass all the random tests, but I fail 2 predetermined ones:

Testing for 1234567890
Expected
    <int>: 1234567980
to equal
    <int>: 1234567908

And

Testing for 59884848459853
Expected
    <int>: 59884848495853
to equal
    <int>: 59884848483559

I am maybe stupid, but that does not seem to be right answers at all, how is the 0 bigger than 8 and then in the second one 9 has to jump to the end?