[cln] Code cleanup

Cleanup code
Add a offset delay timer

src/rom.rs

@@ -0,0 +1,12 @@
+use std::fs::File;
+use std::io::Read;
+use crate::util::EmulatorResult;
+
+pub const ROM_SIZE: usize = 4096 - 0x200;
+
+pub fn load_rom(rom_file_location: String) -> EmulatorResult<[u8; ROM_SIZE]> {
+    let mut rom_slice = [0u8; ROM_SIZE];
+    let mut file = File::open(rom_file_location)?;
+    file.read(&mut rom_slice)?;
+    Ok(rom_slice)
+}