refactor the fixCharge function of parser
refactor the fixCharge function of parser

pierrelb/RMG-Py,nickvandewiele/RMG-Py,nyee/RMG-Py,nickvandewiele/RMG-Py,nyee/RMG-Py,chatelak/RMG-Py,pierrelb/RMG-Py,chatelak/RMG-Py