replaced count consonants/vowels with a more generic snippet

Author: Mcbencrafter

snippets/java/string-manipulation/count-character-occurrences.md

@@ -0,0 +1,26 @@
+---
+title: Count Character Occurrences
+description: Counts the occurrences of the specified characters in a given string
+author: Mcbencrafter
+tags: string,characters,counter,occurence
+---
+
+```java
+import java.util.List;
+
+public static int countCharacterOccurrences(String text, List<Character> characters) {
+    int count = 0;
+    
+    for (char character : text.toCharArray()) {
+        if (characters.indexOf(character) == -1)
+            continue;
+                
+        count++;
+    }
+    
+    return count;
+}
+
+// Usage:
+System.out.println(countCharacterOccurrences("hello world", List.of('l', 'o'))); // 5
+```