'F::3 ', // 1
With row one it looks like a corridor. How would you read original map array and then convert it to the following below converted array through a function? Example:
Original map
' xxxxxx x ', // 1
' x ', // 2
' xxxxxx ' // 3
Converted map
' L*...J U ', // 1
' H ', // 2
' L::::3 ' // 3