notString

Problem:

Given a string, return a new string where "not " has been added to the front. However, if the string already begins with "not", return the string unchanged. Note: use .equals() to compare 2 strings.

Test Cases:
notString("candy") → "not candy"
notString("x") → "not x"
notString("not bad") → "not bad"

Solution:
 public String notString(String str) {
  if(str.startsWith("not"))
  {
  return str;
  }
  return "not"+" "+str;
}