Create a function that takes the width, height and character and returns a picture frame as a matrix.

Examples

getFrame(4, 5, "#") ➞ [
  "####",
  "#  #",
  "#  #",
  "#  #",
  "####"
]
// Frame is 4 characters wide and 5 characters tall.


getFrame(10, 3, "*") ➞ [
  "**********",
  "*        *",
  "**********"
]
// Frame is 10 characters and wide and 3 characters tall.


getFrame(2, 5, "0") ➞ ["invalid"]
// Frame's width is not more than 2.

Notes

• Remember the gap.
• Return ["invalid"] if width or height is 2 or less (can't put anything inside).