fix: change location of others to correct places (#5559)

src/main/java/com/thealgorithms/strings/CountChar.java

@@ -0,0 +1,20 @@
+package com.thealgorithms.strings;
+
+public final class CountChar {
+    private CountChar() {
+    }
+
+    /**
+     * Counts the number of non-whitespace characters in the given string.
+     *
+     * @param str the input string to count the characters in
+     * @return the number of non-whitespace characters in the specified string;
+     *         returns 0 if the input string is null
+     */
+    public static int countCharacters(String str) {
+        if (str == null) {
+            return 0;
+        }
+        return str.replaceAll("\\s", "").length();
+    }
+}