strchr.c: (in function func)
strchr.c:5:4: Dereference of possibly null pointer c: *c
   strchr.c:4:7: Storage c may become null
strchr.c:5:3: Suspect modification of observer c: *c = 'd'
   strchr.c:4:7: Storage *c becomes observer

Finished checking --- 2 code warnings, as expected