Added 'Delete' key functionality

editor.c

@@ -61,13 +61,20 @@ void buffer_insert(char ch, Buffer* buffer) {
 	}
 }
 
-void buffer_delete(Buffer* buffer) {
+void buffer_delete_front(Buffer* buffer) {
 	if (buffer->start != buffer->text) {
 		buffer->start--;
 		buffer->gap_size++;
 	}
 }
 
+void buffer_delete_back(Buffer* buffer) {
+	if (buffer->end != buffer->text + buffer->size) {
+		buffer->end++;
+		buffer->gap_size++;
+	}
+}
+
 void buffer_right(Buffer* buffer) {
 	if (buffer->end != buffer->text + buffer->size) {
 		char c = *(buffer->end);
@@ -248,7 +255,11 @@ int main(int argc, char** argv) {
 
 		switch(ch) {
 			case KEY_BACKSPACE:
-				buffer_delete(buffer);
+				buffer_delete_front(buffer);
+				break;
+
+			case KEY_DC:
+				buffer_delete_back(buffer);
 				break;
 
 			case KEY_LEFT: