X: foo
Y: bar
X append Y: foobar
capitalize_first X: Foo
uncapitalize_first CapX: foo
int_to_string 1234: 1234
octal 1234: 2322
hexadecimal 1234: 4D2
string_to_int 5678: 5678
Five f's: fffff
Five f's and five dots: fffff.....
Five dashes, five f's and five dots: -----fffff.....