diff --git a/src/brainfuck/__brainfuck.py b/src/brainfuck/__brainfuck.py
index b107665..a6b9ef3 100644
--- a/src/brainfuck/__brainfuck.py
+++ b/src/brainfuck/__brainfuck.py
@@ -24,14 +24,11 @@ class BrainFuckByteCodeCompiler:
         self.source_data: bytearray = data
 
     def compile(self) -> bytearray:
-        # whitespace_b = whitespace.encode()
-        valid_b = set(ord(s) for s in BrainFuckByteCode.keys())
-        self.source_data = bytearray(b for b in self.source_data if b in valid_b)
-
-        out = bytearray()
-        for byte in self.source_data:
-            out.append(BrainFuckByteCode[chr(byte)])
-        return out
+        return bytearray(
+            BrainFuckByteCode[c]
+            for byte in self.source_data
+            if (c := chr(byte)) in BrainFuckByteCode
+        )
 
 
 class BrainFuckEnterpreter(Enterpreter):