diff --git a/.gitmodules b/.gitmodules
index 14e9b30..b593b43 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "wavelib"]
 	path = wavelib
-	url = https://github.com/CodePurble/wavelib.git
+	url = https://github.com/codepurble/wavelib.git
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..9505c7f
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,30 @@
+# adapted from https://spin.atomicobject.com/2016/08/26/makefile-c-projects/
+TARGET_EXEC ?= main
+
+BUILD_DIR ?= ./build
+SRC_DIR ?= ./src
+INC_DIR ?= ./include
+
+SRCS := $(shell find $(SRC_DIR) -name *.c)
+OBJS := $(SRCS:%=$(BUILD_DIR)/%.o)
+DEPS := $(OBJS:.o=.d)
+
+INC_FLAGS := $(addprefix -I,$(INC_DIR))
+
+CFLAGS ?= $(INC_FLAGS) -Wall -MMD -MP
+
+$(BUILD_DIR)/$(TARGET_EXEC): $(OBJS)
+	$(CC) $(OBJS) -o $@ $(LDFLAGS)
+
+$(BUILD_DIR)/%.c.o: %.c
+	$(MKDIR_P) $(dir $@)
+	$(CC) $(CFLAGS) -c $< -o $@
+
+.PHONY: clean
+
+clean:
+	$(RM) -r $(BUILD_DIR)/*
+
+-include $(DEPS)
+
+MKDIR_P ?= mkdir -p
diff --git a/src/main.c b/src/main.c
index ba34158..3bdf1c7 100644
--- a/src/main.c
+++ b/src/main.c
@@ -8,14 +8,16 @@
 
 int main()
 {
-    FILE *fptr = fopen("/home/ramprakash/rpdata/nie/study-material/sem6/miniproject/libezw/utils/raw_lichtenstein_img_processing_test_bw.bin", "rb");
+    // FILE *fptr = fopen("/mnt/d/libezw/utils/raw_lichtenstein_img_processing_test_bw.bin", "rb");
+    FILE *fptr = fopen("/mnt/d/libezw/build/ll.bin", "wb");
+
     unsigned char *pix_arr = calloc(ROWS*COLS, 1); // array of 8 bit vals
     if(!fptr) {
         fprintf(stderr, "Unable to open file\n");
     }
     else {
-        read_binary_file(fptr, pix_arr, ROWS, COLS);
-        fclose(fptr);
+        // read_binary_file(fptr, pix_arr, ROWS, COLS);
+        // fclose(fptr);
         wave_object obj;
         wt2_object wt;
         double *inp, *wavecoeffs, *oup, *cLL;
@@ -40,8 +42,10 @@ int main()
         wavecoeffs = dwt2(wt, inp);
         cLL = getWT2Coeffs(wt, wavecoeffs, 1, "A", &ir, &ic);
 
-        dispWT2Coeffs(cLL, ir, ic);
+        // dispWT2Coeffs(cLL, ir, ic);
+        printf("Hello %f\n",cLL[100]);
 
+        write_binary_file(fptr, cLL, ROWS/4, COLS/4);
         wt2_summary(wt);
 
         // clean up
diff --git a/src/utils.c b/src/utils.c
index 604f751..b3cdbbc 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -1,6 +1,11 @@
 #include "utils.h"
 
-void read_binary_file(FILE *in, unsigned char* dest, int rows, int cols)
+void read_binary_file(FILE *infile, unsigned char* dest, int rows, int cols)
 {
-    fread(dest, 1, rows*cols, in);
+    fread(dest, 1, rows*cols, infile);
+}
+
+void write_binary_file(FILE *outfile, unsigned char *src, int rows, int cols)
+{
+    fwrite(src, 1, rows*cols, outfile);
 }