bael-2361 (#5804)

* bael-2361

* Update RemoveLeadingAndTrailingZeroes.java

* moving examples to java-string project

java-strings/src/main/java/com/baeldung/string/removeleadingtrailingchar/RemoveLeadingAndTrailingZeroes.java

@@ -0,0 +1,103 @@
+package com.baeldung.string.removeleadingtrailingchar;
+
+
+import org.apache.commons.lang3.StringUtils;
+
+import com.google.common.base.CharMatcher;
+
+public class RemoveLeadingAndTrailingZeroes {
+
+    public static String removeLeadingZeroesWithStringBuilder(String s) {
+        StringBuilder sb = new StringBuilder(s);
+
+        while (sb.length() > 1 && sb.charAt(0) == '0') {
+            sb.deleteCharAt(0);
+        }
+
+        return sb.toString();
+    }
+
+    public static String removeTrailingZeroesWithStringBuilder(String s) {
+        StringBuilder sb = new StringBuilder(s);
+
+        while (sb.length() > 1 && sb.charAt(sb.length() - 1) == '0') {
+            sb.setLength(sb.length() - 1);
+        }
+
+        return sb.toString();
+    }
+
+    public static String removeLeadingZeroesWithSubstring(String s) {
+        int index = 0;
+
+        for (; index < s.length() - 1; index++) {
+            if (s.charAt(index) != '0') {
+                break;
+            }
+        }
+
+        return s.substring(index);
+    }
+
+    public static String removeTrailingZeroesWithSubstring(String s) {
+        int index = s.length() - 1;
+
+        for (; index > 0; index--) {
+            if (s.charAt(index) != '0') {
+                break;
+            }
+        }
+
+        return s.substring(0, index + 1);
+    }
+
+    public static String removeLeadingZeroesWithApacheCommonsStripStart(String s) {
+        String stripped = StringUtils.stripStart(s, "0");
+
+        if (stripped.isEmpty() && !s.isEmpty()) {
+            return "0";
+        }
+
+        return stripped;
+    }
+
+    public static String removeTrailingZeroesWithApacheCommonsStripEnd(String s) {
+        String stripped = StringUtils.stripEnd(s, "0");
+
+        if (stripped.isEmpty() && !s.isEmpty()) {
+            return "0";
+        }
+
+        return stripped;
+    }
+
+    public static String removeLeadingZeroesWithGuavaTrimLeadingFrom(String s) {
+        String stripped = CharMatcher.is('0')
+            .trimLeadingFrom(s);
+
+        if (stripped.isEmpty() && !s.isEmpty()) {
+            return "0";
+        }
+
+        return stripped;
+    }
+
+    public static String removeTrailingZeroesWithGuavaTrimTrailingFrom(String s) {
+        String stripped = CharMatcher.is('0')
+            .trimTrailingFrom(s);
+
+        if (stripped.isEmpty() && !s.isEmpty()) {
+            return "0";
+        }
+
+        return stripped;
+    }
+
+    public static String removeLeadingZeroesWithRegex(String s) {
+        return s.replaceAll("^0+(?!$)", "");
+    }
+
+    public static String removeTrailingZeroesWithRegex(String s) {
+        return s.replaceAll("(?!^)0+$", "");
+    }
+}