According to https://gis.stackexchange.com/questions/279874/using-qgis3-processing-algorithms-from-standalone-pyqgis-scripts-outside-of-gui/279937#279937 I try to implement the existing "Split Lines with Lines" algorithm into a QGIS Plugin.

To do this I need the path, where the algorithm file is stored, but I do not manage to find it. Can you tell me where it is stored and if there is an easy way to find out, where algorithms are stored?