refactor code - clean switch and if statements

Signed-off-by: amghazanfari <a.m.ghazanfari76@gmail.com>

core/snapshots/snapshotter.go

@@ -65,10 +65,10 @@ func ParseKind(s string) Kind {
 		return KindActive
 	case "committed":
 		return KindCommitted
-	}
-
+	default:
 		return KindUnknown
 	}
+}
 
 // String returns the string representation of the Kind
 func (k Kind) String() string {
@@ -79,10 +79,10 @@ func (k Kind) String() string {
 		return "Active"
 	case KindCommitted:
 		return "Committed"
-	}
-
+	default:
 		return "Unknown"
 	}
+}
 
 // MarshalJSON the Kind to JSON
 func (k Kind) MarshalJSON() ([]byte, error) {
@@ -102,26 +102,28 @@ func (k *Kind) UnmarshalJSON(b []byte) error {
 
 // KindToProto converts from [Kind] to the protobuf definition [snapshots.Kind].
 func KindToProto(kind Kind) snapshotsapi.Kind {
-	if kind == KindActive {
+	switch kind {
+	case KindActive:
 		return snapshotsapi.Kind_ACTIVE
-	}
-	if kind == KindView {
+	case KindView:
 		return snapshotsapi.Kind_VIEW
-	}
+	default:
 		return snapshotsapi.Kind_COMMITTED
 	}
+}
 
 // KindFromProto converts from the protobuf definition [snapshots.Kind] to
 // [Kind].
 func KindFromProto(kind snapshotsapi.Kind) Kind {
-	if kind == snapshotsapi.Kind_ACTIVE {
+	switch kind {
+	case snapshotsapi.Kind_ACTIVE:
 		return KindActive
-	}
-	if kind == snapshotsapi.Kind_VIEW {
+	case snapshotsapi.Kind_VIEW:
 		return KindView
-	}
+	default:
 		return KindCommitted
 	}
+}
 
 // Info provides information about a particular snapshot.
 // JSON marshalling is supported for interacting with tools like ctr,