Refactoring operation name : extract class

Refactoring object : MakeBytesToSegment

Reason : makeNumeric, changeNumericToSegment, containNonNumericCharaters
has independent role.
So, make these function to class(MakeNumericToSegment).

java/src/main/java/io/nayuki/qrcodegen/MakeNumericToSegment.java

@@ -0,0 +1,33 @@
+import java.util.Objects;
+
+public class MakeNumericToSegment  implements MakeSegment {
+
+	/**
+	 * Returns a segment representing the specified string of decimal digits encoded in numeric mode.
+	 * @param digits the text (not {@code null}), with only digits from 0 to 9 allowed
+	 * @return a segment (not {@code null}) containing the text
+	 * @throws NullPointerException if the string is {@code null}
+	 * @throws IllegalArgumentException if the string contains non-digit characters
+	 */
+	public QrSegment excute(String digits) {
+		Objects.requireNonNull(digits);
+		if (containNonNumericCharaters(digits))
+			throw new IllegalArgumentException("String contains non-numeric characters");
+		
+		BitBuffer bitBuffer = new BitBuffer();
+		changeNumericToSegment(digits, bitBuffer);
+		return new QrSegment(QrSegment.Mode.NUMERIC, digits.length(), bitBuffer);
+	}
+	
+	public static void changeNumericToSegment(String digits, BitBuffer bitBuffer) {
+		for (int i = 0; i < digits.length(); ) {  // Consume up to 3 digits per iteration
+			int n = Math.min(digits.length() - i, 3);
+			bitBuffer.appendBits(Integer.parseInt(digits.substring(i, i + n)), n * 3 + 1);
+			i += n;
+		}
+	}
+	
+	public static boolean containNonNumericCharaters(String digits) {
+		return !QrSegment.NUMERIC_REGEX.matcher(digits).matches();
+	}
+}

java/src/main/java/io/nayuki/qrcodegen/QrSegment.java

@@ -49,36 +49,6 @@ public final class QrSegment {
 	
 	/*---- Static factory functions (mid level) ----*/
 	
-	/**
-	 * Returns a segment representing the specified string of decimal digits encoded in numeric mode.
-	 * @param digits the text (not {@code null}), with only digits from 0 to 9 allowed
-	 * @return a segment (not {@code null}) containing the text
-	 * @throws NullPointerException if the string is {@code null}
-	 * @throws IllegalArgumentException if the string contains non-digit characters
-	 */
-	public QrSegment makeNumeric(String digits) {
-		Objects.requireNonNull(digits);
-		if (containNonNumericCharaters(digits))
-			throw new IllegalArgumentException("String contains non-numeric characters");
-		
-		BitBuffer bitBuffer = new BitBuffer();
-		changeNumericToSegment(digits, bitBuffer);
-		return new QrSegment(QrSegment.Mode.NUMERIC, digits.length(), bitBuffer);
-	}
-	
-	public static void changeNumericToSegment(String digits, BitBuffer bitBuffer) {
-		for (int i = 0; i < digits.length(); ) {  // Consume up to 3 digits per iteration
-			int n = Math.min(digits.length() - i, 3);
-			bitBuffer.appendBits(Integer.parseInt(digits.substring(i, i + n)), n * 3 + 1);
-			i += n;
-		}
-	}
-	
-	public static boolean containNonNumericCharaters(String digits) {
-		return !QrSegment.NUMERIC_REGEX.matcher(digits).matches();
-	}
-	/**
-	
 	/**
 	 * Returns a segment representing the specified text string encoded in alphanumeric mode.
 	 * The characters allowed are: 0 to 9, A to Z (uppercase only), space,