diff --git a/string_test/Cargo.lock b/string_test/Cargo.lock
new file mode 100644
index 0000000..55c4352
--- /dev/null
+++ b/string_test/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "string_test"
+version = "0.1.0"
diff --git a/string_test/Cargo.toml b/string_test/Cargo.toml
new file mode 100644
index 0000000..1b8e8b4
--- /dev/null
+++ b/string_test/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "string_test"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
diff --git a/string_test/src/main.rs b/string_test/src/main.rs
new file mode 100644
index 0000000..bd2fe2f
--- /dev/null
+++ b/string_test/src/main.rs
@@ -0,0 +1,18 @@
+/* 填空并修复所有错误 */
+fn main() {
+    let raw_str = "Escapes don't work here: \x3F \u{211D}";
+    // 修改上面的行让代码工作
+    assert_eq!(raw_str, "Escapes don't work here: ? ℝ");
+
+    // 如果你希望在字符串中使用双引号，可以使用以下形式
+    let quotes = r#"And then I said: "There is no escape!""#;
+    println!("{}", quotes);
+
+    // 如果希望在字符串中使用 # 号，可以如下使用：
+    let delimiter = r###"A string with "# in it. And even "##!"###;
+    println!("{}", delimiter);
+
+    // 填空
+    let long_delimiter = "Hello, \"##\"";
+    assert_eq!(long_delimiter, "Hello, \"##\"")
+}