Function execute 

pub fn execute<Memory, IF>(
    regs: &mut Registers<<Instruction as BaseInstruction>::Reg>,
    memory: &mut Memory,
    instruction_fetcher: &mut IF,
) -> Result<(), ExecutionError<Instruction, &'static str>>
where
    Memory: VirtualMemory,
    IF: InstructionFetcher<Instruction, Memory, &'static str>,

Execute Instructions