Correct stdout, updating lib and some clippy clean

src/current_weather_output.rs

@@ -1,3 +1,5 @@
+use std::fmt::Display;
+
 use serde::{Deserialize, Serialize};
 
 use crate::{
@@ -16,58 +18,45 @@ pub struct CurrentWeatherOutput {
     pub data: CurrentWeatherOutputModel,
 }
 
-impl CurrentWeatherOutput {
-    pub fn new(
-        format: DataFormat,
-        temperature_unit: TempUnit,
-        speed_unit: SpeedUnit,
-    ) -> CurrentWeatherOutput {
-        CurrentWeatherOutput {
-            format,
-            temperature_unit,
-            speed_unit,
-            data: CurrentWeatherOutputModel::new(),
-        }
-    }
-
-    pub fn to_string(&self) -> String {
+impl Display for CurrentWeatherOutput {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         if DataFormat::JSON == self.format {
-            serde_json::to_string(&self.data).unwrap()
+            write!(f, "{}", serde_json::to_string(&self.data).unwrap())
         } else {
             let mut string_vec: Vec<String> = Vec::new();
 
             if DataFormat::Normal == self.format {
                 string_vec.push(self.create_header());
             } else {
-                if self.data.latitude.is_some() {
-                    string_vec.push(self.data.latitude.unwrap().to_string())
+                if let Some(latitude) = self.data.latitude {
+                    string_vec.push(latitude.to_string())
                 }
-                if self.data.longitude.is_some() {
-                    string_vec.push(self.data.longitude.unwrap().to_string())
+                if let Some(longitude) = self.data.longitude {
+                    string_vec.push(longitude.to_string())
                 }
-                if self.data.city.is_some() {
-                    string_vec.push(self.data.city.clone().unwrap().to_string())
+                if let Some(city) = &self.data.city {
+                    string_vec.push(city.to_string())
                 }
             }
 
             let is_day = self.extract_day();
-            if is_day.is_some() {
-                string_vec.push(is_day.unwrap());
+            if let Some(is_day) = is_day {
+                string_vec.push(is_day);
             }
 
             let temperature = self.extract_temperature();
-            if temperature.is_some() {
-                string_vec.push(temperature.unwrap());
+            if let Some(temperature) = temperature {
+                string_vec.push(temperature);
             }
 
             let windspeed = self.extract_wind_speed();
-            if windspeed.is_some() {
-                string_vec.push(windspeed.unwrap());
+            if let Some(windspeed) = windspeed {
+                string_vec.push(windspeed);
             }
 
             let winddirection = self.extract_wind_direction();
-            if winddirection.is_some() {
-                string_vec.push(winddirection.unwrap());
+            if let Some(winddirection) = winddirection {
+                string_vec.push(winddirection);
             }
 
             if DataFormat::Normal == self.format
@@ -90,14 +79,26 @@ impl CurrentWeatherOutput {
             }
 
             if DataFormat::Clean == self.format {
-                let final_string = string_vec.join(",");
-                final_string
+                write!(f, "{}", string_vec.join(","))
             } else {
                 string_vec.push(self.create_footer());
-                string_vec.join("\n")
+                write!(f, "{}", string_vec.join("\n"))
             }
         }
     }
+}
+
+impl CurrentWeatherOutput {
+    pub fn new(
+        format: DataFormat,
+        temperature_unit: TempUnit,
+        speed_unit: SpeedUnit,
+    ) -> CurrentWeatherOutput {
+        CurrentWeatherOutput {
+            format, temperature_unit, speed_unit,
+            data: CurrentWeatherOutputModel::new(),
+        }
+    }
 
     fn create_header(&self) -> String {
         let mut title_header: Vec<String> = Vec::new();
@@ -166,15 +167,15 @@ impl CurrentWeatherOutput {
 
     fn parse_custom_data(&self, data: &str, custom: &str) -> String {
         if self.format == DataFormat::Clean {
-            format!("{data}")
+            data.to_string()
         } else {
-            format!("{custom}")
+            custom.to_string()
         }
     }
 
     fn parse_simple_data(&self, data: &str, descriptor: &str, end_text: Option<&str>) -> String {
         if self.format == DataFormat::Clean {
-            format!("{data}")
+            data.to_string()
         } else {
             let end_text = end_text.unwrap_or("");
             format!("{descriptor}: {data}{end_text}")