add more test cases for removeHyphens function

Author: Brymon

__test__/removeHyphens.test.js

@@ -5,4 +5,6 @@ test("removeHyphens() should all hyphens from a string of text", () => {
   expect(removeHyphens("not the definition of insanity - e=mc2")).toEqual(
     "not the definition of insanity   e=mc2"
   );
+  expect(removeHyphens("")).toEqual("");
+  expect(removeHyphens(null)).toEqual(null);
 });

src/utils/removeHyphens.js

@@ -1,3 +1,3 @@
-const removeHyphens = string => (!string ? string : string.replace(/-/g, " "));
+const removeHyphens = string => string.replace(/-/g, " ");
 
 export default removeHyphens;