added all files into building

Makefile

@@ -1,6 +1,13 @@
 all: main
 
-files = src/main.c
+# Main file
+files = src/test/main.c
+
+# Source files
+files += src/encrypter.c
+
+# Header files
+files += include/encrypter.h
 
 main:
 	cc $(files) -o out/why2