diff --git a/.gitignore b/.gitignore
index f47cb20..bebb0b7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
-*.out
+/challenge/*.o
+/doorchallenge
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..465fd0d
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,27 @@
+TARGET=doorchallenge
+
+CC:=gcc
+LD:=$(CC)
+
+LDLIBS=
+LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro
+CFLAGS=-Wall \
+	-Wextra \
+	-Winit-self \
+	-Wuninitialized \
+	-Wfloat-equal \
+	-Wint-to-pointer-cast \
+	-pedantic \
+	-O2 \
+	-fstack-protector-strong
+
+all: $(TARGET)
+
+$(TARGET): challenge/challenge.o
+	$(LD) $(LDFLAGS) -o $@ $^ $(LDLIBS)
+
+challenge/%.o: challenge/%.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
+clean:
+	$(RM) -rf challenge/*.o $(TARGET)
diff --git a/challenge/challenge.c b/challenge/challenge.c
index 7354425..c100906 100644
--- a/challenge/challenge.c
+++ b/challenge/challenge.c
@@ -1,28 +1,26 @@
+#include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
 
 int main() {
-    int bytes_read;
-    size_t nbytes = 10; 
-    char **my_string = malloc(sizeof(char**));
+    int ret;
+    size_t nbytes = 0;
+    char *input_str = NULL;
     char *password = "23door42\n";
 
     puts("Please enter Password: ");
+    ret = getline(&input_str, &nbytes, stdin);
 
-    bytes_read = getline(my_string, &nbytes, stdin);
-
-    if(bytes_read == -1) {
+    if (ret == -1) {
         puts("Error");
-        return -1;
+    } else if (strcmp(input_str, password) == 0) {
+        puts("Success");
+        ret = 0;
     } else {
-        if (strcmp(*my_string, password) == 0) {
-            puts("Success");
-            return 0;
-        } else {
-            puts("How about no?!");
-            return -1;
-        }
+        puts("How about no?!");
+        ret = -1;
     }
 
-    return 0;
+    free(input_str);
+    return ret;
 }
diff --git a/dooropen b/dooropen
old mode 100644
new mode 100755
diff --git a/lock b/lock
old mode 100644
new mode 100755
diff --git a/unlock b/unlock
old mode 100644
new mode 100755