BAEL-3597 Cactoos (#8512)

* BAEL-3597 Cactoos

* BAEL-3597 Cactoos

* BAEL-3597 Cactoos

* BAEL-3597 Cactoos

libraries-3/src/main/java/com/baeldung/cactoos/CactoosCollectionUtils.java

@@ -0,0 +1,28 @@
+package com.baeldung.cactoos;
+
+import java.util.Collection;
+import java.util.List;
+
+import org.cactoos.collection.Filtered;
+import org.cactoos.iterable.IterableOf;
+import org.cactoos.list.ListOf;
+import org.cactoos.scalar.And;
+import org.cactoos.text.FormattedText;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class CactoosCollectionUtils {
+
+	final Logger LOGGER = LoggerFactory.getLogger(CactoosCollectionUtils.class);
+
+	public void iterateCollection(List<String> strings) throws Exception {
+		new And((String input) -> LOGGER.info(new FormattedText("%s\n", input).asString()), strings).value();
+	}
+
+	public Collection<String> getFilteredList(List<String> strings) {
+		Collection<String> filteredStrings = new ListOf<>(
+				new Filtered<>(string -> string.length() == 5, new IterableOf<>(strings)));
+		return filteredStrings;
+	}
+
+}

libraries-3/src/main/java/com/baeldung/cactoos/CactoosStringUtils.java

@@ -0,0 +1,37 @@
+package com.baeldung.cactoos;
+
+import java.io.IOException;
+
+import org.cactoos.text.FormattedText;
+import org.cactoos.text.IsBlank;
+import org.cactoos.text.Lowered;
+import org.cactoos.text.TextOf;
+import org.cactoos.text.Upper;
+
+public class CactoosStringUtils {
+
+	public String createString() throws IOException {
+		String testString = new TextOf("Test String").asString();
+		return testString;
+	}
+
+	public String createdFormattedString(String stringToFormat) throws IOException {
+		String formattedString = new FormattedText("Hello %s", stringToFormat).asString();
+		return formattedString;
+	}
+
+	public String toLowerCase(String testString) throws IOException {
+		String lowerCaseString = new Lowered(new TextOf(testString)).asString();
+		return lowerCaseString;
+	}
+
+	public String toUpperCase(String testString) throws Exception {
+		String upperCaseString = new Upper(new TextOf(testString)).asString();
+		return upperCaseString;
+	}
+
+	public boolean isBlank(String testString) throws Exception {
+		return new IsBlank(new TextOf(testString)) != null;
+	}
+
+}