feat: skip minting gns block

- if emission is ended

_deploy/r/gnoswap/gns/gns.gno

@@ -52,8 +52,10 @@ func MintGns(address pusers.AddressOrName) uint64 {
 	lastMintedHeight := GetLastMintedHeight()
 	currentHeight := std.GetHeight()
 
-	// skip minting process if gns for current block is already minted
-	if skipIfSameHeight(lastMintedHeight, currentHeight) {
+	// skip minting process if following conditions are met
+	// - if gns for current block is already minted
+	// - if emission has ended
+	if skipIfSameHeight(lastMintedHeight, currentHeight) || skipIfEmissionEnded(currentHeight) {
 		return 0
 	}
 
@@ -142,10 +144,6 @@ func calculateAmountToMint(fromHeight, toHeight int64) uint64 {
 	fromYear := GetHalvingYearByHeight(fromHeight)
 	toYear := GetHalvingYearByHeight(toHeight)
 
-	if isEmissionEnded(fromYear) || isEmissionEnded(toYear) {
-		return 0
-	}
-
 	totalAmountToMint := uint64(0)
 
 	for i := fromYear; i <= toYear; i++ {
@@ -205,14 +203,13 @@ func skipIfSameHeight(lastMintedHeight, currentHeight int64) bool {
 	return false
 }
 
-// isEmissionEnded returns true if the emission is ended.
-// It returns false if the emission is not ended.
-func isEmissionEnded(year int64) bool {
-	if 1 <= year && year <= 12 {
-		return false
+// skipIfEmissionEnded returns true if the emission has ended.
+func skipIfEmissionEnded(height int64) bool {
+	if isEmissionEnded(height) {
+		return true
 	}
 
-	return true
+	return false
 }
 
 func GetLastMintedHeight() int64 {

_deploy/r/gnoswap/gns/gns_test.gno

@@ -108,6 +108,16 @@ func TestSkipIfSameHeight(t *testing.T) {
 	})
 }
 
+func TestSkipIfEmissionEnded(t *testing.T) {
+	t.Run("should skip if emission has ended", func(t *testing.T) {
+		uassert.True(t, skipIfEmissionEnded(GetEndHeight()+1))
+	})
+
+	t.Run("should not skip if emission has not ended", func(t *testing.T) {
+		uassert.False(t, skipIfEmissionEnded(std.GetHeight()))
+	})
+}
+
 func TestGetterSetter(t *testing.T) {
 	t.Run("last minted height", func(t *testing.T) {
 		value := int64(1234)