showtree prints error

Microshell/microshell.c

@@ -35,19 +35,21 @@ void rmChar(char *str, char garbage) {   /*przesledzic jak to dziala!!!!! w opis
     *dst = '\0';
 }
 
-void cd (char **argv){
+int cd (char **argv){
 	if(argv[1] == NULL){
 		printf("Add arguments\n");
-		return;
+		return -1;
 	}
 	else if(argv[2] != NULL){
 		printf("Too many arguments\n");
-		return;
+		return -1;
 	}
 	else{
-		if (chdir(argv[1]) != 0)
+		if (chdir(argv[1]) != 0){
 			perror("chdir error");
-		return;
+			return -1;
+		}
+		return 0;
 	}
 }
 
@@ -117,7 +119,8 @@ void tree (char **argv, char * directory){
 					printf("Showtree prints catalog and file structure\ntakes no arguments \nor exacly 1 argument for desired directory\n");
 					exit(0);
 				}
-				cd(argv);
+				if(cd(argv) == -1)
+					exit(0);
 				getcwd(ndr, sizeof(ndr));
 			}
 			else