👩‍💻 Add CI check if code is formatted (#25)

# 🔍 Objective

Currently, we don't check if the code in the repo is formatted.

## 🆕 Added

New CI job that does that.

.github/workflows/rust.yaml

@@ -33,6 +33,18 @@ jobs:
       - name: Build
         run: cargo build --verbose
 
+  fmt:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: dtolnay/rust-toolchain@stable
+      with:
+        toolchain: ${{ env.rust_min }}
+        components: rustfmt
+    - uses: Swatinem/rust-cache@v2
+    - name: Format
+      run: cargo fmt --check
+
   clippy:
     name: clippy
     runs-on: ubuntu-latest

bitcoin-testscripts/src/u32mul.rs

@@ -77,7 +77,11 @@ impl SplitableScript<{ INPUT_SIZE }, { OUTPUT_SIZE }> for U32MulScript {
 
 impl U32MulScript {
     /// Splits the script into shards with a given chunk size
-    pub fn split_with_chunk_size(input: Script, split_type: SplitType, chunk_size: usize) -> SplitResult {
+    pub fn split_with_chunk_size(
+        input: Script,
+        split_type: SplitType,
+        chunk_size: usize,
+    ) -> SplitResult {
         Self::split(input, split_type, chunk_size)
     }
 }
@@ -134,7 +138,8 @@ mod tests {
         let IOPair { input, output } = U32MulScript::generate_valid_io_pair();
 
         // Splitting the script into shards
-        let split_result = U32MulScript::split_with_chunk_size(input, SplitType::ByInstructions, SPLIT_SIZE);
+        let split_result =
+            U32MulScript::split_with_chunk_size(input, SplitType::ByInstructions, SPLIT_SIZE);
 
         for shard in split_result.shards.iter() {
             println!("Shard: {:?}", shard.len());