Add each rule to the compiler instead of joining

Since compiler.add_source allows for it to be called multiple times,
we can simply loop over each rule and call it once for each, rather than
trying to join all the rules into one big string then compiling.

src/client/models.rs

@@ -71,15 +71,10 @@ pub struct RulesResponse {
 impl RulesResponse {
     /// Compile the rules from the response
     pub fn compile(&self) -> Result<yara_x::Rules> {
-        let rules_str = self
-            .rules
-            .values()
-            .map(String::as_ref)
-            .collect::<Vec<&str>>()
-            .join("\n");
-
         let mut compiler = yara_x::Compiler::new();
-        compiler.add_source(rules_str.as_str())?;
+        for source in self.rules.values() {
+            compiler.add_source(source.as_str())?;
+        }
 
         Ok(compiler.build())
     }