From 673a4a93888148ad405746e2c845487bb4d6bb1c Mon Sep 17 00:00:00 2001
From: jackfiled <xcrenchangjun@outlook.com>
Date: Mon, 22 Apr 2024 10:00:39 +0800
Subject: [PATCH] 20240422 Finished

---
 src/problem/mod.rs                            |  3 ++-
 ...dex_of_the_first_occurrence_in_a_string.rs | 27 +++++++++++++++++++
 2 files changed, 29 insertions(+), 1 deletion(-)
 create mode 100644 src/problem/p28_find_the_index_of_the_first_occurrence_in_a_string.rs

diff --git a/src/problem/mod.rs b/src/problem/mod.rs
index 0360ce6..cfb95fa 100644
--- a/src/problem/mod.rs
+++ b/src/problem/mod.rs
@@ -108,4 +108,5 @@ mod p134_gas_station;
 mod p135_candy;
 mod p42_trapping_rain_water;
 mod p58_length_of_last_word;
-mod p151_reverse_words_in_a_string;
\ No newline at end of file
+mod p151_reverse_words_in_a_string;
+mod p28_find_the_index_of_the_first_occurrence_in_a_string;
\ No newline at end of file
diff --git a/src/problem/p28_find_the_index_of_the_first_occurrence_in_a_string.rs b/src/problem/p28_find_the_index_of_the_first_occurrence_in_a_string.rs
new file mode 100644
index 0000000..a0d8c7d
--- /dev/null
+++ b/src/problem/p28_find_the_index_of_the_first_occurrence_in_a_string.rs
@@ -0,0 +1,27 @@
+/**
+ * [28] Find the Index of the First Occurrence in a String
+ */
+pub struct Solution {}
+
+
+// submission codes start here
+
+impl Solution {
+    pub fn str_str(haystack: String, needle: String) -> i32 {
+        match haystack.find(&needle)  {
+            Some(pos) => pos as i32,
+            None => -1   
+        }
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_28() {
+    }
+}