Added lines to check cases and return count of characters.

Author: Mahtem

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

@@ -1,5 +1,23 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  if (typeof stringOfCharacters!= "string") {
+    throw new Error("Input should be a string");
+  }
+   if (typeof findCharacter !== "string" || findCharacter.length != 1){
+    throw new Error ("Input must be a single character");
+  }
+
+  let count = 0;
+  for(let char of stringOfCharacters) {
+     if (char === findCharacter) {
+      count++;
+     }
+ }
+    return count;
+
 }
 
 module.exports = countChar;
+
+console.log(countChar("amazon", "a"));
+
+// Added lines to check cases and return count of characters.