# All lowercase, nur buchstaben und ziffern, remove spaces, underscores
public static function toLowercase(string $string): string

# All uppercase, remove spaces, underscores
public static function toUppercase(string $string): string

# lowerCamelCase
public static function toCamelCase(string $string): string

# UpperCamelCase
public static function toUpperCamelCase(string $string): string

# snake_case
public static function toSnakeCase(string $string): string

# slugify-a-string
public static function slugify(string $string): string