Function apply_moves 

pub fn apply_moves(facelet: &String, cube_moves: &String) -> Option<String>

Apply moves to a Rubik’s cube represented by facelet

Arguments

• facelet - the Rubik’s cube to be moved, must be a solvable Rubik’s cube
• cube_moves - should match ([URFDLB][123'] ?)*

Return facelet of the moved cube on success