$ perl -E 'say join(" ", split /(..)/, "e58c97e4bab0")'
 e5  8c  97  e4  ba  b0

$ perl -E 'say join(" ", split /(..)/, "e58c97e4bab0") =~ s/^\s+|\s+$//r'
e5  8c  97  e4  ba  b0