fix all compiler warnings

rust/src/main.rs

@@ -1,8 +1,11 @@
-use crate::webserver::webserver::httpd;
+use crate::{
+    config::BoardVersion::INITIAL,
+    hal::{PlantHal, HAL, PLANT_COUNT},
+    webserver::webserver::httpd,
+};
 use anyhow::bail;
 use chrono::{DateTime, Datelike, Timelike, Utc};
-use chrono_tz::Tz;
-use chrono_tz::Tz::UTC;
+use chrono_tz::Tz::{self, UTC};
 use esp_idf_hal::delay::Delay;
 use esp_idf_sys::{
     esp_ota_get_app_partition_count, esp_ota_get_running_partition, esp_ota_get_state_partition,
@@ -15,23 +18,21 @@ use esp_ota::{mark_app_valid, rollback_and_reboot};
 use hal::battery::BatteryState;
 use log::{log, LogMessage};
 use once_cell::sync::Lazy;
+use plant_state::PlantState;
 use serde::{Deserialize, Serialize};
 use std::sync::MutexGuard;
 use std::{
     fmt::Display,
     sync::{atomic::AtomicBool, Arc, Mutex},
 };
+use tank::*;
+
 mod config;
 mod hal;
 mod log;
 mod plant_state;
 mod tank;
 
-use crate::config::BoardVersion::INITIAL;
-use crate::hal::battery::BatteryInteraction;
-use crate::hal::{BoardInteraction, PlantHal, HAL, PLANT_COUNT};
-use plant_state::PlantState;
-use tank::*;
 pub static BOARD_ACCESS: Lazy<Mutex<HAL>> = Lazy::new(|| PlantHal::create().unwrap());
 pub static STAY_ALIVE: Lazy<AtomicBool> = Lazy::new(|| AtomicBool::new(false));
 
@@ -424,7 +425,7 @@ fn safe_main() -> anyhow::Result<()> {
         .state_charge_percent()
         .unwrap_or(0.);
 
-    /// try to load full battery state if failed the battery state is unknown
+    // try to load full battery state if failed the battery state is unknown
     let battery_state = board
         .board_hal
         .get_battery_monitor()
@@ -739,7 +740,8 @@ fn pump_info(
 
 fn publish_battery_state(board: &mut MutexGuard<'_, HAL<'_>>) {
     let state = board.board_hal.get_battery_monitor().get_battery_state();
-    if let Ok(serialized_battery_state_bytes) = serde_json::to_string(&state).map(|s| s.into_bytes())
+    if let Ok(serialized_battery_state_bytes) =
+        serde_json::to_string(&state).map(|s| s.into_bytes())
     {
         let _ = board
             .board_hal