[TASK] Moved StringUtils to Internal API StringUtil

src/main/java/org/parabot/environment/api/utils/StringUtils.java

@@ -1,52 +1,10 @@
 package org.parabot.environment.api.utils;
 
+import org.parabot.api.misc.StringUtil;
+
 /**
  * @author mkyong, JKetelaar
  */
-public class StringUtils {
+public class StringUtils extends StringUtil {
 
-	private static java.util.Random random = new java.util.Random();
-	private static char[] chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890".toCharArray();
-
-	public static String convertHexToString(String hex) {
-
-		StringBuilder sb = new StringBuilder();
-		StringBuilder temp = new StringBuilder();
-		
-		for (int i = 0; i < hex.length() - 1; i += 2) {
-
-			// grab the hex in pairs
-			String output = hex.substring(i, (i + 2));
-			// convert hex to decimal
-			int decimal = Integer.parseInt(output, 16);
-			// convert the decimal to character
-			sb.append((char) decimal);
-
-			temp.append(decimal);
-		}
-
-		return sb.toString();
-	}
-
-	public static String implode(String separator, String... data) {
-		StringBuilder sb = new StringBuilder();
-		for (int i = 0; i < data.length - 1; i++) {
-			//data.length - 1 => to not add separator at the end
-			if (!data[i].matches(" *")) {//empty string are ""; " "; "  "; and so on
-				sb.append(data[i]);
-				sb.append(separator);
-			}
-		}
-		sb.append(data[data.length - 1].trim());
-		return sb.toString();
-	}
-
-	public static String randomString(final int length) {
-		StringBuilder sb = new StringBuilder();
-		for (int i = 0; i < 20; i++) {
-			char c = chars[random.nextInt(chars.length)];
-			sb.append(c);
-		}
-		return sb.toString();
-	}
 }