diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..bec6c8c
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,14 @@
+EX=devil1test
+CC=gcc
+CFLAGS= -I"include"
+
+all: main
+
+main: devil1pld.o
+	$(CC) $^ test/main.c $(CFLAGS) -o $(EX) 
+
+devil1pld.o: src/devil1pld.c
+	$(CC) -c $^ $(CFLAGS)
+
+clean:
+	rm *.o $(EX)
diff --git a/devil1geo.h b/include/devil1geo.h
similarity index 100%
rename from devil1geo.h
rename to include/devil1geo.h
diff --git a/devil1pld.h b/include/devil1pld.h
similarity index 58%
rename from devil1pld.h
rename to include/devil1pld.h
index 2f92cc8..2082afc 100644
--- a/devil1pld.h
+++ b/include/devil1pld.h
@@ -9,4 +9,10 @@ struct PldHeader {
     uint32_t *offsets; // <format=hex>
 };
 
+// input: a pld header struct.
+void showpldh(struct PldHeader *);
+
+// input: contents of the .pld file.
+struct PldHeader *getpldh(const char*);
+
 #endif
\ No newline at end of file
diff --git a/src/devil1pld.c b/src/devil1pld.c
new file mode 100644
index 0000000..5169a17
--- /dev/null
+++ b/src/devil1pld.c
@@ -0,0 +1,37 @@
+#include "devil1pld.h"
+#include "stdio.h"
+#include "stdlib.h"
+#include "string.h"
+
+void printpldh(struct PldHeader *ph) {
+    if (ph == NULL) {
+        return;
+    }
+    printf("number of offsets = %i\n", ph -> numOffset);
+    unsigned int i;
+    for (i = 0; i < ph -> numOffset; i++) {
+        printf("offset %i = %x\n", i, ph -> offsets[i]);
+    }
+}
+
+struct PldHeader *getpldh(const char *buffer) {
+    if (buffer == NULL) {
+        return NULL;
+    }
+    int32_t *n                = (int32_t*)buffer;
+    struct PldHeader *ph      = (struct PldHeader*)malloc(
+        sizeof(struct PldHeader)
+    );   
+    uint32_t size_offsets = sizeof(uint32_t) * n[0];
+    ph -> offsets         = (uint32_t*)malloc(size_offsets);
+    if (ph -> offsets == NULL) {
+        perror("Error 4: ");
+        free(ph);
+        free(ph -> offsets);
+        return NULL;
+    }
+    // set data of struct.
+    ph -> numOffset = n[0];
+    memcpy(ph -> offsets, buffer + sizeof(int32_t), size_offsets);
+    return ph;
+}
diff --git a/main.c b/test/main.c
similarity index 76%
rename from main.c
rename to test/main.c
index ca27635..42020b5 100644
--- a/main.c
+++ b/test/main.c
@@ -44,36 +44,6 @@ void splitpld(const char *buffer,
     free(wbuffer);
 }
 
-void showpldh(struct PldHeader *x) {
-    printf("number of offsets = %i\n", x -> numOffset);
-    unsigned int i;
-    for (i = 0; i < x -> numOffset; i++) {
-        printf("offset %i = %x\n", i, x -> offsets[i]);
-    }
-}
-
-struct PldHeader *getpldh(const char *buffer) {
-    if (buffer == NULL) {
-        return NULL;
-    }
-    int32_t *n                = (int32_t*)buffer;
-    struct PldHeader *ph      = (struct PldHeader*)malloc(
-        sizeof(struct PldHeader)
-    );   
-    uint32_t size_offsets = sizeof(uint32_t) * n[0];
-    ph -> offsets         = (uint32_t*)malloc(size_offsets);
-    if (ph -> offsets == NULL) {
-        perror("Error 4: ");
-        free(ph);
-        free(ph -> offsets);
-        return NULL;
-    }
-    // set data of struct.
-    ph -> numOffset = n[0];
-    memcpy(ph -> offsets, buffer + sizeof(int32_t), size_offsets);
-    return ph;
-}
-
 char *loadfile(const char *fname, unsigned int *s) {
     FILE *f           = fopen(fname, "rb");
     unsigned int size = 0; // number of elements to buffer;