[REFACTOR] Renamed copySubstring to substring [API] Made substring public
[REFACTOR] Renamed copySubstring to substring
[API] Made substring public

bkahlert/com.bkahlert.nebula,bkahlert/com.bkahlert.nebula,bkahlert/com.bkahlert.nebula,bkahlert/com.bkahlert.nebula,bkahlert/com.bkahlert.nebula