diff --git a/1044-longest-duplicate-substring.go b/1044-longest-duplicate-substring.go
new file mode 100644
index 0000000..af40257
--- /dev/null
+++ b/1044-longest-duplicate-substring.go
@@ -0,0 +1,57 @@
+package main
+
+func LongestDupSubstringBruteforce(s string) string {
+	strLen := len(s)
+	if strLen < 2 {
+		return ""
+	}
+
+	res := ""
+	for ln := 1; ln < strLen; ln++ {
+		for i := 0; i <= strLen-ln; i++ {
+			word1 := s[i : i+ln]
+			count := 0
+			for j := 0; j <= strLen-ln; j++ {
+				word2 := s[j : j+ln]
+				if word1 == word2 {
+					count++
+					if count > 1 {
+						res = word1
+						break
+					}
+				}
+			}
+		}
+	}
+
+	return res
+}
+
+func LongestDupSubstringReversedBruteforce(s string) string {
+	strLen := len(s)
+	if strLen < 2 {
+		return ""
+	}
+
+	for ln := strLen - 1; ln >= 1; ln-- {
+		for i := strLen - ln; i >= 0; i-- {
+			word1 := s[i : i+ln]
+			count := 0
+			for j := strLen - ln; j >= 0; j-- {
+				word2 := s[j : j+ln]
+				if word1 == word2 {
+					count++
+					if count > 1 {
+						return word1
+					}
+				}
+			}
+		}
+	}
+
+	return ""
+}
+
+func LongestDupSubstring(s string) string {
+	return LongestDupSubstringBruteforce(s)
+}
diff --git a/1044-longest-duplicate-substring_test.go b/1044-longest-duplicate-substring_test.go
new file mode 100644
index 0000000..29eee98
--- /dev/null
+++ b/1044-longest-duplicate-substring_test.go
@@ -0,0 +1,18 @@
+package main
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestLongestDupSubstring(t *testing.T) {
+	assert.Equal(t, "ana", LongestDupSubstring("banana"))
+	assert.Equal(t, "", LongestDupSubstring("abcd"))
+	assert.Equal(t, "aaa", LongestDupSubstring("aaaa"))
+	assert.Equal(t, "", LongestDupSubstring(""))
+	assert.Equal(t, "", LongestDupSubstring("a"))
+	assert.Equal(t, "x", LongestDupSubstring("xx"))
+	assert.Equal(t, "xx", LongestDupSubstring("xxx"))
+	assert.Equal(t, "bananab", LongestDupSubstring("bananabananab"))
+	assert.Equal(t, "sfd", LongestDupSubstring("polxtvqlurgobbzbjcjsupskvzmtuveuavrzcxaifmdwqjbuejdasuxcvsupqnucorfawncjqkbakilhiekavhmsjbtlsfydijafxhgrgbsswtnvdquwokcliaxevairergwdtndsibiulqiutkcwsqpzuyypnhiowgvkkdbpkoyvgwyuqcokjnxluamwnuhqjtaossezwxvkpdkqcleqjkelcludtbigxkueupnxjncrbgvdrsdpppqqcopnwadqsxkvlkghfmtvdeygpyxamvxhmmaunxskgnenobvnzizbxwrjeedisrgzykoaidiffzqzsmirxkvfwmtifywamcpxziyjohcudzelgbmdgiaqwnzdbkwbhdioiokaivzlzscshrvbmggdztjuimribrgmdlcctvldbcxwpqnqbkzrcayqdqraobqcgoxxocclasphcjcydpkgkqhrmmxtklpxfxnrgnzczjxanaltnjhwfatgryqhcllemgqcchiagizpdgiqioqyhrpattutmuotrcwtxvdqzzsomofizebbqrgwruydyawsssjkakjpjlzmfhmjetymftxrhilpcgfqyoohyydnodfortlkeoncmfkdraiqydxcodyapjaxumjwczwmthrcecfgsswwtnyqurvggamjbsjdzmcuyefwnsrnhhpusfdsxbsrsrywbccullupdbovnmzluqsfdhqbef"))
+}