forgot to add clipboard.c last commit

c_clipboard.c

@@ -0,0 +1,24 @@
+void
+c_copy(char *c) {
+	c += 2;
+	int start = atoi(c);
+	for(; *c != '\0' && *c != ' '; c++);
+	int end = atoi(c);
+	Row *cpy_start = b_getline(buffer, start);
+	if(cpy_start == NULL || b_getline(buffer, end) == NULL) {
+		puts("invalid line.");
+		return;
+	}
+	if (clipboard != NULL) {
+		b_truncate(clipboard);
+		free(clipboard);
+	}
+	clipboard = calloc(1, sizeof(Row));
+	Row *dest = clipboard;
+	for (int i = start; i <= end; i++) {
+		memcpy(dest->text, cpy_start->text, ROW_SIZE);
+		cpy_start = cpy_start->n;
+		dest = b_insert(dest);
+	}
+}
+