diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 7d3507f..4ec5059 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -46,7 +46,8 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: stable
+          toolchain: 1.85.0
+          target: wasm32-unknown-unknown
           override: true
           components: clippy
       - uses: actions-rs/cargo@v1
diff --git a/src/course_format.rs b/src/course_format.rs
index 8e7cf2d..2b3b180 100644
--- a/src/course_format.rs
+++ b/src/course_format.rs
@@ -41,16 +41,12 @@ pub fn course_format_full(list_course: &str) -> String {
     if to_format.is_empty() {
         final_string
     } else {
-        let mut previous_char = to_format.chars().nth(0).unwrap();
+        let mut previous_char = to_format.chars().next().unwrap();
         for item in to_format.chars() {
             if item.is_alphanumeric() && item != ' ' {
                 final_string = final_string + &item.to_string();
-            } else {
-                if previous_char.is_alphanumeric() {
-                    if !final_string.is_empty() {
-                        final_string = final_string + ", "
-                    }
-                }
+            } else if previous_char.is_alphanumeric() && !final_string.is_empty() {
+                final_string += ", "
             }
             previous_char = item;
         }
diff --git a/src/snowflake_id_format.rs b/src/snowflake_id_format.rs
index 69f60fb..f5e1d13 100644
--- a/src/snowflake_id_format.rs
+++ b/src/snowflake_id_format.rs
@@ -41,20 +41,16 @@ pub fn course_format_full(list_course: &str) -> String {
     if to_format.is_empty() {
         final_string
     } else {
-        let mut previous_char = to_format.chars().nth(0).unwrap();
+        let mut previous_char = to_format.chars().next().unwrap();
         for item in to_format.chars() {
             if item.is_alphanumeric() && item != ' ' {
                 final_string = final_string + &item.to_string();
-            } else {
-                if previous_char.is_alphanumeric() {
-                    if !final_string.is_empty() {
-                        final_string = final_string + "', '"
-                    }
-                }
+            } else if previous_char.is_alphanumeric() && !final_string.is_empty() {
+                final_string += "', '"
             }
             previous_char = item;
         }
-        final_string = final_string + "'";
+        final_string += "'";
         final_string
     }
 }