1st day

ImplementstrStr.rb

@@ -0,0 +1,13 @@
+def str_str(haystack, needle)
+    return 0 if (haystack.empty? && needle.empty?) || (haystack.empty? == false && needle.empty?)
+    (0..haystack.size-1).each do |i|
+      if haystack[i..i+needle.size-1] == needle
+        return i
+      end
+    end
+    return -1
+
+
+end
+
+puts str_str("aaaa","bba")