Adder the type alias error_t and refactored the code to use it. also extracted archive function from install.c to archives.c

src/archives.h

@@ -0,0 +1,30 @@
+#ifndef __ARCHIVES_H__
+#define __ARCHIVES_H__
+
+//all of these function will make every file into lowercase
+
+/**
+ * @brief Execute the unzip command
+ * @param path path to archive
+ * @param outdir output director
+ * @return int return code
+ */
+int unzip(char * path, char * outdir);
+
+/**
+ * @brief Execute the unrar command
+ * @param path path to archive
+ * @param outdir output director
+ * @return int return code
+ */
+int unrar(char * path, char * outdir);
+
+/**
+ * @brief Execute the 7z command
+ * @param path path to archive
+ * @param outdir output director
+ * @return int return code
+ */
+int un7z(char * path, const char * outdir);
+
+#endif