Completed countChar implementation - passes all 7 Jest test cases

Author: Eugenie-A

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

@@ -1,5 +1,11 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let count = 0;
+  for (const character of stringOfCharacters) {
+    if(character === findCharacter) {
+      count++;
+    }
+  }
+  return count;
 }
 
 module.exports = countChar;