Exclamation marks series #4: Remove all exclamation marks from sentence but ensure a exclamation mark at the end of string

/*


Description:
Remove all exclamation marks from sentence but ensure a exclamation mark at the end of string. For a beginner kata, you can assume that the input data is always a non empty string, no need to verify it.

Examples
"Hi!"     ---> "Hi!"
"Hi!!!"   ---> "Hi!"
"!Hi"     ---> "Hi!"
"!Hi!"    ---> "Hi!"
"Hi! Hi!" ---> "Hi Hi!"
"Hi"      ---> "Hi!"


*/


export function remove(s: string): string {
  return s.replace(/!+/g,'') + '!';
}