Cleanup code

src/fan_controller.rs

@@ -4,6 +4,8 @@ use anyhow::{anyhow, Result};
 use log::debug;
 
 
+const I2C_BUS_PATH: &str = "/dev/i2c-1";
+
 pub struct FanController {
     expander: Pcf8574<I2cdev>,
     pub is_running: bool,
@@ -20,8 +22,8 @@ impl FanController {
         if temp_on <= temp_off {
             return Err(anyhow!("temp_on must be greater than temp_off"));
         }
-
-        let i2c = I2cdev::new("/dev/i2c-1")?;
+        
+        let i2c = I2cdev::new(I2C_BUS_PATH)?;
         debug!("I2C device initialized");
         let expander = Pcf8574::new(i2c, SlaveAddr::default());
         debug!("pcf8574 IO Expander initialized");
@@ -35,7 +37,7 @@ impl FanController {
     }
 
     pub fn fan_on(&mut self) -> Result<(), Box<dyn std::error::Error>> {
-        debug!("Sending fan on signal [p0: low");
+        debug!("Sending fan on signal [p0: low]");
         let mut parts = self.expander.split();
         parts.p0.set_low().unwrap();
         self.is_running = true;