Update Makefile + file and folder structure

Changed Makefile and file position for compilation.

makefile

-SRC_DIR := Sources
-OBJ_DIR := obj
-BIN_DIR := bin
+CC:=gcc
+CFLAGS:=-g -O3 -Wextra -pedantic -fsanitize=address
+LDFLAGS:=-lm
+NAME:=stack
 
-EXE := $(BIN_DIR)/stack.exe #exe name
-SRC := $(wildcard $(SRC_DIR)/*.c)
-OBJ := $(SRC:$(SRC_DIR)/%.c=$(OBJ_DIR)/%.o)
+$(NAME): main.o $(NAME).o
+    $(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS) -lSDL2
 
-CPPFLAGS := -Iinclude -MMD -MP
-CFLAGS   := -Wall
-LDFLAGS  := -Llib
-LDLIBS   := -lm
+tests: $(NAME)_tests.o $(NAME).o
+    $(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
 
-.PHONY: all clean
-
-all: $(EXE)
-
-$(EXE): $(OBJ) | $(BIN_DIR)
-	$(CC) $(LDFLAGS) $^ $(LDLIBS) -o $@
-
-$(OBJ_DIR)/%.o: $(SRC_DIR)/%.c | $(OBJ_DIR)
-	$(CC) $(CPPFLAGS) $(CFLAGS) -c $< -o $@
-
-$(BIN_DIR) $(OBJ_DIR):
-	mkdir -p $@
+$(NAME).o: $(NAME).h
 
 clean:
-	@$(RM) -rv $(BIN_DIR) $(OBJ_DIR)
-
--include $(OBJ:.o=.d)
\ No newline at end of file
+    rm -f *.o $(NAME) tests
\ No newline at end of file