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diff --git a/find-the-index-of-the-first-occurrence-in-a-string/Cargo.toml b/find-the-index-of-the-first-occurrence-in-a-string/Cargo.toml
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+++ b/find-the-index-of-the-first-occurrence-in-a-string/Cargo.toml
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+[package]
+name = "find-the-index-of-the-first-occurrence-in-a-string"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/find-the-index-of-the-first-occurrence-in-a-string/src/main.rs b/find-the-index-of-the-first-occurrence-in-a-string/src/main.rs
new file mode 100644
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+++ b/find-the-index-of-the-first-occurrence-in-a-string/src/main.rs
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+fn main() {
+    println!("Hello, world!");
+}
+
+struct Solution;
+
+impl Solution {
+    pub fn str_str(haystack: String, needle: String) -> i32 {
+        match haystack.find(&needle) {
+            None => -1,
+            Some(e) => e as i32
+        }
+    }
+}