Multiplying by 0 should return an empty string?

For st = zljyGr oCzpPm vdfzkgVCzr HUXAxhUnOH OTFDBwFRuZxhoHk dZpB KuPgHdDIQBfCQRaVWMg oxhtZyZMnoSD BAzXxWGYRxgLgRXwxK OeFftW hLBxNyJBnvtfvVwtZp EvsMkixFmAUSyhYHEyF
loc = 1
num = 0
Result is not what expected
Expected
:
to equal
: oCzpPm

Thanks for the context; this is my first encounter with "mutation testing" https://en.wikipedia.org/wiki/Mutation_testing

It's unclear which requirements, in the kata's description, the test is covering.

"Input mutation test" Solution changed input

How is that unclear?

With go, 208 tests pass and 1 fails. The failure is:
"Input mutation test":

Solution changed input
Expected
<[]int | len:7, cap:7>: [1, 1, 1, 1, 1, 1, 1]
to equal
<[]int | len:7, cap:7>: [1, 1, 2, 2, 2, 1, 1]

Unclear what this test is testing for.