diff --git a/Makefile b/Makefile
index 77bf9be..81175b8 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,7 @@ OBJS =\
 	base64\
 	hash/sha256\
 
-TOOLS =\
+TOOLS = ${LIB}
 
 TESTS =\
 	test-hex\
@@ -91,7 +91,7 @@ ${OBJDIR}/%${-g}-cov.o: ${SRCDIR}/%.cpp ${INCDIR}/${LIB}/%.hpp
 	${CC} -o $@ -c $< -I${INCDIR} ${-l} ${CFLAGS} --coverage
 
 ${BINDIR}/%${-g}-cov: ${TESTDIR}/%.cpp ${patsubst %, ${OBJDIR}/%${-g}-cov.o, ${OBJS}}
-	${CC} -o $@ $^ -I${INCDIR} ${-l} -lgtest ${CFLAGS} --coverage
+	${CC} -o $@ $^ -I${INCDIR} ${-l} -lgtest -lgcov ${CFLAGS}
 
 clean:
 	rm -rf ${DIRS}
diff --git a/src/basen.cpp b/src/basen.cpp
new file mode 100644
index 0000000..08ace15
--- /dev/null
+++ b/src/basen.cpp
@@ -0,0 +1,29 @@
+#include <iostream>
+
+#include <argparse/argparse.hpp>
+
+#include <basen.hpp>
+
+int main(int argc, char *argv[])
+{
+    argparse::ArgumentParser program("basen", "1.1.0");
+    program.add_argument("-t", "--type")
+        .help("encoding type")
+        .metavar("STRING")
+        .choices("base58", "base64", "hex")
+        .default_value("hex");
+    program.add_argument("-d", "--decode")
+        .help("is decode")
+        .flag();
+    try
+    {
+        program.parse_args(argc, argv);
+    }
+    catch (const std::exception &err)
+    {
+        std::cerr << err.what() << '\n';
+        std::cerr << program;
+        return 1;
+    }
+    return 0;
+}
\ No newline at end of file