Editing the code and jest code

Author: Alaa-Tagi

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

@@ -1,7 +1,17 @@
 function countChar(stringOfCharacters, findCharacter) {
-    return stringOfCharacters.split(findCharacter).length - 1;
+  if (
+    typeof stringOfCharacters !== "string" ||
+    typeof findCharacter !== "string" ||
+    findCharacter.length !== 1
+  ) {
+    return 0;
   }
 
-module.exports = countChar;
+  if (stringOfCharacters.length === 0) {
+    return 0;
+  }
 
+  return stringOfCharacters.split(findCharacter).length - 1;
+}
 
+module.exports = countChar;