removed all C-style casts

src/enemies/viking.h

@@ -0,0 +1,14 @@
+#ifndef __VIKING_H__
+#define __VIKING_H__
+
+#include "../enemy.h"
+
+class viking final: public enemy_base {
+public:
+        viking(RNG *rng, const feature enabled_features, const position &pos,
+               const int gen_room_num);
+        const char *get_race_name() const override;
+        long_result attack(character *ch) override;
+};
+
+#endif