fix: made ShardStorage mutable across all tests

Author: thewoodfish

README.md

@@ -371,7 +371,7 @@ Here’s how you can set up and use SwarmNL's sharding capabilities:
 
     // Implement the `ShardStorage` trait for our local storage
     impl ShardStorage for LocalStorage {
-        fn fetch_data(&self, key: ByteVector) -> ByteVector {
+        fn fetch_data(&mut self, key: ByteVector) -> ByteVector {
             // Process each key in the ByteVector
             for sub_key in key.iter() {
                 let key_str = String::from_utf8_lossy(sub_key);

examples/sharding/hash-based/src/main.rs

@@ -83,7 +83,7 @@ impl LocalStorage {
 
 // Implement the `ShardStorage` trait for our local storage
 impl ShardStorage for LocalStorage {
-	fn fetch_data(&self, key: ByteVector) -> ByteVector {
+	fn fetch_data(&mut self, key: ByteVector) -> ByteVector {
 		// Process each key in the ByteVector
 		for sub_key in key.iter() {
 			let key_str = String::from_utf8_lossy(sub_key);

examples/sharding/range-based/src/main.rs

@@ -73,7 +73,7 @@ struct LocalStorage {
 
 // Implement the `ShardStorage` trait for our local storage
 impl ShardStorage for LocalStorage {
-	fn fetch_data(&self, key: ByteVector) -> ByteVector {
+	fn fetch_data(&mut self, key: ByteVector) -> ByteVector {
 		// Convert the key to a UTF-8 string
 		let key_str = String::from_utf8_lossy(&key[0]);
 

research.md

@@ -353,7 +353,7 @@ The `ShardStorage` trait allows nodes to `trap` into their application logic and
 /// forwarded data requests. This is a mechanism to trap into the application storage layer to read
 /// sharded data.
 pub trait ShardStorage: Send + Sync + Debug {
-	fn fetch_data(&self, key: ByteVector) -> ByteVector;
+	fn fetch_data(&mut self, key: ByteVector) -> ByteVector;
 }
 ```
 
@@ -386,7 +386,7 @@ This approach ensures flexibility, efficiency, and thread-safe handling of data.
 
    // Implement the `ShardStorage` trait for our local storage
    impl ShardStorage for LocalStorage {
-      fn fetch_data(&self, key: ByteVector) -> ByteVector {
+      fn fetch_data(&mut self, key: ByteVector) -> ByteVector {
          // Process each key in the ByteVector
          for sub_key in key.iter() {
             let key_str = String::from_utf8_lossy(sub_key);

swarm-nl/src/core/tests/sharding.rs

@@ -53,7 +53,7 @@ struct LocalStorage {
 
 // Implement the `ShardStorage` trait for our local storage
 impl ShardStorage for LocalStorage {
-	fn fetch_data(&self, key: ByteVector) -> ByteVector {
+	fn fetch_data(&mut self, key: ByteVector) -> ByteVector {
 		// Convert the key to a UTF-8 string
 		let key_str = String::from_utf8_lossy(&key[0]);