added leetcode daily challenge task #28 from 3/3/2023

Author: nesterrovv

src/task_28/Solution.java

@@ -0,0 +1,26 @@
+package task_28;
+
+public class Solution {
+
+    public static void main(String[] args) {
+        String haystack = "missis_sippi";
+        String needle = "issip";
+        System.out.println(strStr(haystack, needle));
+    }
+    public static int strStr(String haystack, String needle) {
+        if (haystack.length() < needle.length()) {
+            return -1;
+        }
+        for (int i = 0; i <= haystack.length() - needle.length(); i++){
+            int j = 0;
+            while (j < needle.length() && haystack.charAt(i + j) == needle.charAt(j)) {
+                j++;
+            }
+            if (j == needle.length()) {
+                return i;
+            }
+        }
+        return -1;
+    }
+
+}