fix: quell notice

src/wc/wc.v

@@ -22,7 +22,7 @@ struct FileChunk {
 mut:
 	prev_char_is_space bool
 	buffer             []u8
-	is_last_chunk      bool = false
+	is_last_chunk      bool
 }
 
 struct Count {
@@ -105,7 +105,7 @@ fn (mut file_reader FileReader) read_chunk(mut buffer []u8) ?FileChunk {
 	}
 
 	nbytes := file_reader.file.read(mut buffer) or { return none } // Propagate error. Either EOF or read error.
-	mut chunk := FileChunk{file_reader.last_char_is_space, buffer[..nbytes], false}
+	mut chunk := FileChunk{file_reader.last_char_is_space, buffer[..nbytes].clone(), false}
 	file_reader.last_char_is_space = is_space(buffer[nbytes - 1])
 	if nbytes < buffer.len {
 		chunk.is_last_chunk = true