static cast + missing newline fix

Author: uzairnawaz

libc/src/__support/wchar/character_converter.cpp

@@ -87,7 +87,7 @@ ErrorOr<char8_t> CharacterConverter::pop_utf8() {
   }
 
   state->bytes_processed++;
-  return (char8_t)output;
+  return static_cast<char8_t>(output);
 }
 
 } // namespace internal

libc/test/src/__support/wchar/utf32_to_8_test.cpp

@@ -177,4 +177,4 @@ TEST(LlvmLibcCharacterConverterUTF32To8Test, CantPushMidConversion) {
   // can't push a utf32 without finishing popping the utf8 bytes out
   int err = cr.push(utf32);
   ASSERT_EQ(err, -1);
-}
+}