refactor: replace util with go generics

internal/utils/typeutil/typeutil.go

@@ -1,5 +1,11 @@
 package typeutil
 
+import (
+	"time"
+
+	"golang.org/x/exp/constraints"
+)
+
 // Keys returns a slice of the keys of the map. based with go 1.18 generics
 func Keys[K comparable, V any](m map[K]V) []K {
 	r := make([]K, 0, len(m))
@@ -8,3 +14,32 @@ func Keys[K comparable, V any](m map[K]V) []K {
 	}
 	return r
 }
+
+func IntToBool[T constraints.Signed](a T) bool {
+	switch a {
+	case 0, -1:
+		return false
+	}
+	return true
+}
+
+func TimeStamp(stamp int64) time.Time {
+	s := time.Unix(stamp, 0)
+	if s.Local().Year() > 9999 {
+		return time.Date(9999, 12, 13, 23, 59, 59, 0, time.Local)
+	}
+	return s
+}
+
+func TimeEpoch(epoch int64) time.Time {
+	maxTime := int64(99633311740000000)
+	if epoch > maxTime {
+		return time.Date(2049, 1, 1, 1, 1, 1, 1, time.Local)
+	}
+	t := time.Date(1601, 1, 1, 0, 0, 0, 0, time.Local)
+	d := time.Duration(epoch)
+	for i := 0; i < 1000; i++ {
+		t = t.Add(d)
+	}
+	return t
+}