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.gitignore

@@ -15,3 +15,4 @@
 # Dependency directories (remove the comment below to include it)
 # vendor/
 
+.idea

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
+}

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
+}

go.mod

@@ -0,0 +1,3 @@
+module g.arns.lt/zordsdavini/abcex
+
+go 1.16