Leading spaces could be important to the formatting of the resultant text. When importing values from CONT lines the reader should assume only one delimiter character following the CONT tag. Assume that the rest of the leading spaces are to be a part of the value.
GEDKeeper seems to eliminate leading spaces:
@N1@ NOTE
1 CONT 20. Mars 89
1 CONT Nicolas
1 CONT
1 CONT Le 20. 1689 a esté baptisé Nicolas fils de
1 CONT (de belrain en lorraine [allemande?])
1 CONT Nicolas Bettain et de Cathirinne Martin de [la?]
1 CONT (St Avaux)
...
will be stored as
@N1@ NOTE
1 CONT 20. Mars 89
1 CONT Nicolas
1 CONT
1 CONT Le 20. 1689 a esté baptisé Nicolas fils de
1 CONT (de belrain en lorraine [allemande?])
1 CONT Nicolas Bettain et de Cathirinne Martin de [la?]
1 CONT (St Avaux)
...
The GEDCOM specification (https://gedcom.io/specifications/ged551.pdf, page 86) says:
GEDKeeper seems to eliminate leading spaces:
will be stored as