1..13
ok 1 - '\#T\#' -> 'abc'
ok 2 - '\#T\#' -> 'abcd'
ok 3 - '\#T\#' -> 'abcde'
ok 4 - '\#T\#' -> 'abcdef'
ok 5 - '\#T\#' -> 'abcdefg'
ok 6 - '\#T\#' -> 'abcdefghijklm'
ok 7 - '' -> ''
ok 8 - 'xyz' -> 'xyz'
ok 9 - 'MNO \#T\# PQR' -> 'MNO abcdefghijklm PQR'
ok 10 - 'MNO\#T\# PQR' -> 'MNOabcdefghijklm PQR'
ok 11 - 'MNO \#T\#PQR' -> 'MNO abcdefghijklmPQR'
ok 12 - 'MNO\#T\#PQR' -> 'MNOabcdefghijklmPQR'
ok 13 - 'MNO\#\#T\#\#PQR' -> 'MNO\#abcdefghijklm\#PQR'