Concat joins arguments to form a concatenated string.

Difference returns the elements in `a` that aren't in `b` and the elements in `b` that aren't in `a`.

RemoveStringInSlice returns a new slice with all occurrences of s removed, keeping the given slice unmodified.

StringInSlice returns true if the given string is found in the provided slice, else returns false.

StringsInSlice returns true if the given strings are found in the provided slice, else returns false.