[xorcist]

The style issue shellcheck reports here is probably what we both suspect it is.

The call to echo has a likely purpose is to trim some spaces from a string, but it's not at all obvious why this is done or what the benefit is. In the best case, it leaves the reader pondering this weird semi-no-op.

If you think shellcheck, and probably most readers, is wrong in this assertion, just speak your mind and let's learn from one another. But I certainly can't guess your intention here.