Required files
active_support/core_ext/string/inflections
active_support/core_ext/string/conversions
active_support/core_ext/string/access
active_support/core_ext/string/starts_ends_with
active_support/core_ext/string/iterators
active_support/core_ext/string/multibyte
active_support/core_ext/string/xchar
active_support/core_ext/string/filters
active_support/core_ext/string/behavior