move source files to src/ directory

Makefile

@@ -6,16 +6,17 @@ LIBS=$(shell pkg-config --libs xcb x11 xinerama)
 EXEC_NAME=wm
 
 OBJDIR=obj
+SRCDIR=src
 
-SRC=$(wildcard *$(EXT))
-OBJS=$(patsubst %,$(OBJDIR)/%.o, $(basename $(SRC)))
+SRC=$(wildcard $(SRCDIR)/*$(EXT))
+OBJS=$(patsubst %,$(OBJDIR)/%.o, $(basename $(notdir $(SRC))))
 
 $(shell mkdir -p $(dir $(OBJS)) > /dev/null)
 
 $(EXEC_NAME): $(OBJS)
 	$(CC) $(FLAGS) $(LIBS) $^ -o $(EXEC_NAME)
 
-$(OBJDIR)/%.o: %$(EXT)
+$(OBJDIR)/%.o: $(SRCDIR)/%$(EXT)
 	$(CC) $(FLAGS) $(DEPFLAGS) -c -o $@ $<
 
 .PHONY: clean