Change String::append! and String::. use cell_add_cell become to string concat can null data included. Fix few syntax print.
Change String::append! and String::. use cell_add_cell become to string concat can null data included.
Fix few syntax print.

mitchan0321/perfume,mitchan0321/perfume,mitchan0321/perfume,mitchan0321/perfume,mitchan0321/perfume