First commit, everything finished and ready.

functions.c

@@ -0,0 +1,43 @@
+#include <main.h>
+
+int ask_file() {
+
+	printf ("Insert name of the file to be read : ");
+	fgets(info.filename, info.fileNameSize, stdin);
+	info.filename[strlen(info.filename)-1] = '\0';
+	invert_file();
+	return 0;
+}
+
+int get_file(char *fileName) {
+
+	strcpy(info.filename, fileName);
+	invert_file();
+	return 0;
+}
+
+int invert_file(void) {
+
+	if ((info.fd= fopen(info.filename, "r")) != NULL){
+	int ft, i = 0;
+
+    fseek(info.fd, 0, SEEK_END);
+
+    ft = ftell(info.fd);
+    while(i < ft)
+    {
+        i++;
+        fseek(info.fd, -i, SEEK_END);
+        printf("%c", fgetc(info.fd));
+    }
+	printf("\n");
+
+		fclose(info.fd);
+	}
+
+	else {
+		perror(info.filename);
+	}
+
+	return 0;
+}