1st ver

.gitignore

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+.idea
+.vscode

README.md

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+# Validators
+
+Package with multiple complex validation entities (only CPF now)
+
+Usage:
+
+```go
+package main
+
+import (
+	"go.digitalcircle.com.br/open/validators/cpf"
+	"log"
+)
+
+func main() {
+	acpf := "401.852.780-27"
+	if cpf.Check(acpf) {
+		log.Printf("CPF OK: %s", cpf.Format(acpf))
+	}
+}
+
+```

cpf/lib.go

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+package cpf
+
+import (
+	"strconv"
+	"unicode"
+)
+
+//Gets a string and formats is as CPF
+func Format(s string) string {
+	raw := Strip(s)
+	ret := raw[0:3] + "." + raw[3:6] + "." + raw[6:9] + "-" + raw[9:11]
+	return ret
+
+}
+
+//Removes all non-digit symbols
+func Strip(s string) string {
+	ret := ""
+	for _, v := range s {
+		if unicode.IsDigit(v) {
+			ret = ret + string(v)
+		}
+	}
+	return ret
+}
+
+//Checks if verification digit are respected
+func Check(s string) bool {
+	raw := Strip(s)
+	nums := make([]int, 0)
+	for _, v := range raw {
+		i, _ := strconv.Atoi(string(v))
+		nums = append(nums, i)
+	}
+
+	d1 := 0
+	mul := 10
+	for _, v := range nums[0 : len(nums)-2] {
+		d1 = d1 + (v * mul)
+		mul--
+	}
+	mod1 := (d1 * 10) % 11
+
+	d2 := 0
+	mul = 11
+	for _, v := range nums[0 : len(nums)-2] {
+		d2 = d2 + (v * mul)
+		mul--
+	}
+	d2 = d2 + (mod1 * mul)
+
+	mod2 := (d2 * 10) % 11
+	return mod1 == nums[len(nums)-2] && mod2 == nums[len(nums)-1]
+}

cpf/lib_test.go

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+package cpf
+
+import (
+	"log"
+	"testing"
+)
+
+func TestFormat(t *testing.T) {
+	log.Printf(Format("03794020685"))
+}
+
+func TestCheck(t *testing.T) {
+	for _, v := range []string{
+		"377.100.400-47",
+		"377.100.400-46",
+		"845.846.910-37",
+		"845.846.910-17",
+	} {
+		ret := Check(v)
+		log.Printf("%s=>%v", v, ret)
+	}
+
+}

go.mod

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+module go.digitalcircle.com.br/open/validators
+
+go 1.17