Rename delete function

Rename delete() to delete_char() to avoid `clang-format` misinterpreting
`delete()` as the C++ the keyword, which cauese an extra space to be
added when running `clang-format`, turning `delete()` to `delete ()`.

tools/font-edit/twin-fedit.c

@@ -459,7 +459,7 @@ static void split(char_t *c, cmd_t *first, cmd_t *last)
     c->first = c->last = 0;
 }
 
-static void delete(char_t *c, cmd_t *first)
+static void delete_char(char_t *c, cmd_t *first)
 {
     push(c);
     delete_cmd(&c->cmd, first);
@@ -512,7 +512,7 @@ static void play(char_t *c)
     cmd_t *spline = NULL;
     draw_char(c);
 
-    for(;;){
+    for (;;) {
         while (SDL_PollEvent(&event)) {
             switch (event.type) {
             /* If SDL event is detected */
@@ -523,7 +523,7 @@ static void play(char_t *c)
             case SDL_KEYDOWN:
                 /* If any key event is detected */
                 key_event = event.key.keysym.sym;
-                
+
                 switch (key_event) {
                 case SDLK_q:
                     /* To exit play()
@@ -553,7 +553,7 @@ static void play(char_t *c)
                 case SDLK_d:
                     /* To delete the first command */
                     if (c->first) {
-                        delete (c, c->first);
+                        delete_char(c, c->first);
                     }
                     break;
                 case SDLK_DOWN: