diff --git a/src/extra.c b/src/cstring.c
similarity index 100%
rename from src/extra.c
rename to src/cstring.c
diff --git a/src/extra-memory.c b/src/memory.c
similarity index 100%
rename from src/extra-memory.c
rename to src/memory.c
diff --git a/src/extra-stack.c b/src/stack.c
similarity index 100%
rename from src/extra-stack.c
rename to src/stack.c
diff --git a/src/vtype-extra.c b/src/stringify.c
similarity index 100%
rename from src/vtype-extra.c
rename to src/stringify.c