Returns difference between two slices: slice #1 - slice #2 as a set operation.

check if string is empty.

check if string is in slice given.

Checks if the map contains value for the given key - empty values are not allowed.

MergeStructFields merges the source into target, zero value fields are skipped along with fieldsToSkip.

PathExists checks if the given relative path exists and has permission to access it.

replace nested placeholders with XL placeholders.