EP3956321A1 - PROCESS FOR PREPARING AXITINIB, PROCESS FOR PURIFYING THE INTERMEDIATE 2-((3-IODO-1H-INDAZOL-6-YL)THIO)-N-METHYLBENZAMIDE, PROCESS FOR PURIFYING AXITINIB VIA THE AXITINIB HCL SALT, SOLID FORM OF THE AXITINIB HCL SALT