Created functions:
- string_camelcase_dash;
- string_camelcase_separator;
- string_camelcase_underscore;
- string_dash_camelcase;
- string_lower;
- string_repeat;
- string_replace;
- string_replace_all;
- string_scape;
- string_separator_camelcase;
- string_title;
- string_underscore_camelcase;
- string_upper.