Implemented some more functions. Next big step : AddBacking

src/backing.c

@@ -1,7 +1,15 @@
 #include "backing.h"
 
+#include "disk.h"
+#include "entry.h"
+
 #include <stdlib.h>
 #include <string.h>
+#include <errno.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <libgen.h>
+#include <sys/stat.h>
 
 bool IsBackingIdentifierValid(const char* backing_identifier) {
 	if (backing_identifier == NULL)
@@ -22,7 +30,7 @@ bool IsBackingIdentifierValid(const char* backing_identifier) {
 		return false;
 
 	// Check that the identifier starts with a number
-	if (backing_identifier[0] >= '0' && backing_identifier[0] <= '9')
+	if (backing_identifier[0] < '0' || backing_identifier[0] > '9')
 		return false;
 
 	return true;