i.rectify: Fix copy into fixed size buffer issue in main.c of i.recti…

…fy module (#4299)

* Copy into fix size buffer issue

* removed variable Len

* Update imagery/i.rectify/main.c

Co-authored-by: Nicklas Larsson <n_larsson@yahoo.com>

---------

Co-authored-by: Shubham Vasudeo Desai <sdesai8@vclvm178-100.vcl.ncsu.edu>
Co-authored-by: Shubham Vasudeo Desai <sdesai8@vclvm177-82.vcl.ncsu.edu>
Co-authored-by: Nicklas Larsson <n_larsson@yahoo.com>

imagery/i.rectify/main.c

@@ -26,6 +26,8 @@
 #include <string.h>
 #include "global.h"
 
+#include <grass/gis.h>
+
 int seg_mb_img;
 
 func interpolate;
@@ -151,8 +153,14 @@ int main(int argc, char *argv[])
     interpolate = menu[method].method;
 
     G_strip(grp->answer);
-    strcpy(group.name, grp->answer);
-    strcpy(extension, ext->answer);
+    if (G_strlcpy(group.name, grp->answer, sizeof(group.name)) >=
+        sizeof(group.name)) {
+        G_fatal_error(_("Group name <%s> is too long"), grp->answer);
+    }
+    if (G_strlcpy(extension, ext->answer, sizeof(extension)) >=
+        sizeof(extension)) {
+        G_fatal_error(_("Extension <%s> is too long"), ext->answer);
+    }
     order = atoi(val->answer);
 
     seg_mb = NULL;