/* Converts an uppercase letter to a corresponding lowercase letter. Input that
is not an uppercase letter remains unchanged.
*/
/* Converts an uppercase letter to a corresponding lowercase letter. Input that
is not an uppercase letter remains unchanged.
*/
/* Converts a lowercase letter to a corresponding uppercase letter. Input that
is not a lowercase letter remains unchanged.
*/
/* Converts a lowercase letter to a corresponding uppercase letter. Input that
is not a lowercase letter remains unchanged.
*/