Verilog Coding

We need to program a FPGA board using verilog code with XNOR, Multiply, shiftleft and add modules that can run on the board using different switches. When we compile the code there are no errors but when we try to put the code onto the board it is showing only zeros so we think that there is something wrong with the XNOR, Mul, shiftleft or ADD modules. I will attach all codes and the manual for the project below, thanks.