fix countChar function to handle empty character cases and improve iteration logic

Author: alexandru-pocovnicu

Sprint-3/2-practice-tdd/count.js

@@ -1,11 +1,15 @@
 function countChar(stringOfCharacters, findCharacter) {
   let char = 0;
-  for(let i = 0;i < stringOfCharacters.length;i++){
-    if(stringOfCharacters[i] === findCharacter){
+  for(let i = 0;i <= stringOfCharacters.length - findCharacter.length;i++){ 
+    if ( findCharacter.length === 0 || stringOfCharacters === 0){
+      return 0;
+    }
+    if(stringOfCharacters.substring(i, i + findCharacter.length ) === findCharacter){
       char++;
     }
   }
   return char
 }
 
 module.exports = countChar;
+console.log(countChar("aaaaa","a"));