From 26f493cc59718df6d2fee42ab3441cadd26457df Mon Sep 17 00:00:00 2001
From: Arnas Udovicius <zordsdavini@gmail.com>
Date: Tue, 11 May 2021 23:21:06 +0300
Subject: [PATCH] copy from github

---
 .gitignore    |  1 +
 abcex.go      | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++
 abcex_test.go | 14 ++++++++++++++
 go.mod        |  3 +++
 4 files changed, 71 insertions(+)
 create mode 100644 abcex.go
 create mode 100644 abcex_test.go
 create mode 100644 go.mod

diff --git a/.gitignore b/.gitignore
index f4d432a..cdd78af 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,3 +15,4 @@
 # Dependency directories (remove the comment below to include it)
 # vendor/
 
+.idea
\ No newline at end of file
diff --git a/abcex.go b/abcex.go
new file mode 100644
index 0000000..c56804f
--- /dev/null
+++ b/abcex.go
@@ -0,0 +1,53 @@
+package abcex
+
+import "fmt"
+import "math"
+
+var decToAbcex = map[int]string{
+	0: "0", 1: "1", 2: "2", 3: "3", 4: "4", 5: "5", 6: "6", 7: "7",
+	8: "8", 9: "9", 10: "a", 11: "b", 12: "c", 13: "d", 14: "e",
+	15: "f", 16: "g", 17: "h", 18: "i", 19: "j", 20: "k", 21: "l",
+	22: "m", 23: "n", 24: "o", 25: "p", 26: "q", 27: "r", 28: "s",
+	29: "t", 30: "u", 31: "v", 32: "w", 33: "x", 34: "y", 35: "z" }
+
+var abcexToDec = flipMap()
+
+func reverse(s string) string {
+    runes := []rune(s)
+    for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {
+        runes[i], runes[j] = runes[j], runes[i]
+    }
+    return string(runes)
+}
+
+func flipMap() map[string]int {
+    flipped := make(map[string]int)
+    for i, val := range decToAbcex {
+        flipped[val] = i
+    }
+
+    return flipped
+}
+
+func Encode(number int64) string{
+    result := ""
+
+    for number > 0 {
+        result = fmt.Sprintf("%s%s", decToAbcex[int(number % 36)], result)
+        number /= 36
+	}
+
+    return result
+}
+
+func Decode(str string) int64 {
+    var result int64
+	result = 0
+    str = reverse(str)
+
+    for i, c := range str {
+        result = int64(math.Pow(36, float64(i))) * int64(abcexToDec[string(c)]) + result
+    }
+
+    return result
+}
diff --git a/abcex_test.go b/abcex_test.go
new file mode 100644
index 0000000..c43e868
--- /dev/null
+++ b/abcex_test.go
@@ -0,0 +1,14 @@
+package abcex
+
+import "fmt"
+import "testing"
+
+func TestEncode(t *testing.T) {
+    fmt.Println(Encode(12345))
+    // Output: 9ix
+}
+
+func TestDecode(t *testing.T) {
+    fmt.Println(Decode("9ix"))
+    // Output: 12345
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..7d3ad02
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module g.arns.lt/zordsdavini/abcex
+
+go 1.16