Added String type documentation

Makefile

@@ -13,7 +13,6 @@ BENCH_OBJ_DIR = bench_obj
 
 TESTS_SRC = tests
 
-TARGET = usage
 TEST_V_TARGET = test_vector
 TEST_M_TARGET = test_map
 TEST_B_TARGET = test_bigint
@@ -21,16 +20,12 @@ TEST_S_TARGET = test_string
 BENCH_TARGET = benchmark_datum
 
 LIB_OBJS = $(OBJ_DIR)/vector.o $(OBJ_DIR)/map.o $(OBJ_DIR)/bigint.o $(OBJ_DIR)/string.o
-PROG_OBJS = $(OBJ_DIR)/usage.o
 
-.PHONY: all clean
+.PHONY: all clean examples
 
-all: $(TARGET) $(TEST_V_TARGET) $(TEST_M_TARGET) $(TEST_B_TARGET) $(TEST_S_TARGET) $(BENCH_TARGET)
+all: $(TEST_V_TARGET) $(TEST_M_TARGET) $(TEST_B_TARGET) $(TEST_S_TARGET) $(BENCH_TARGET) examples
 bench: $(BENCH_TARGET)
 
-$(TARGET): $(PROG_OBJS) $(LIB_OBJS)
-	$(CC) $(CFLAGS) -o $@ $^
-
 $(TEST_V_TARGET): $(OBJ_DIR)/test_vector.o $(OBJ_DIR)/vector.o
 	$(CC) $(CFLAGS) -o $@ $^
 
@@ -43,10 +38,10 @@ $(TEST_B_TARGET): $(OBJ_DIR)/test_bigint.o $(OBJ_DIR)/bigint.o $(OBJ_DIR)/vector
 $(TEST_S_TARGET): $(OBJ_DIR)/test_string.o $(OBJ_DIR)/string.o
 	$(CC) $(CFLAGS) -o $@ $^
 
-$(OBJ_DIR)/%.o: $(SRC_DIR)/%.c | $(OBJ_DIR)
-	$(CC) $(CFLAGS) -c -o $@ $<
+examples: $(LIB_OBJS)
+	$(MAKE) -C examples
 
-$(OBJ_DIR)/usage.o: usage.c | $(OBJ_DIR)
+$(OBJ_DIR)/%.o: $(SRC_DIR)/%.c | $(OBJ_DIR)
 	$(CC) $(CFLAGS) -c -o $@ $<
 
 $(OBJ_DIR)/%.o: $(TESTS_SRC)/%.c | $(OBJ_DIR)
@@ -69,4 +64,5 @@ $(BENCH_OBJ_DIR):
 	mkdir -p $(BENCH_OBJ_DIR)
 
 clean:
-	rm -rf $(OBJ_DIR) $(BENCH_OBJ_DIR) $(TARGET) $(TEST_V_TARGET) $(TEST_M_TARGET) $(TEST_B_TARGET) $(TEST_S_TARGET) $(BENCH_TARGET)
+	rm -rf $(OBJ_DIR) $(BENCH_OBJ_DIR) $(TEST_V_TARGET) $(TEST_M_TARGET) $(TEST_B_TARGET) $(TEST_S_TARGET) $(BENCH_TARGET)
+	$(MAKE) -C examples clean