Calculates the relative path for this file from base file. Note that the base file is treated as a directory. If this file matches the base file, then an empty string will be returned.
IllegalArgumentException - if this and base paths have different roots.
Return relative path from base to this.
© 2010–2019 JetBrains s.r.o.
Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.io/java.io.-file/to-relative-string.html