minor implement lexer

Makefile

@@ -0,0 +1,23 @@
+CC := gcc
+
+CFLAGS := -Wall -Wextra -Werror -g -I./include
+
+BUILD_DIR := build
+
+SRC := $(wildcard src/*.c)
+OBJ := $(patsubst src/%.c,${BUILD_DIR}/%.o,$(SRC))
+
+TARGET := cval.out
+
+.PHONY: all clean
+
+all: $(TARGET)
+
+$(TARGET): $(OBJ)
+	$(CC) $(CFLAGS) -o $(BUILD_DIR)/$(TARGET) $(OBJ)
+
+$(BUILD_DIR)/%.o: src/%.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
+clean:
+	rm -f $(OBJ) $(BUILD_DIR)/$(TARGET)