text: #include "ush.h"
  
  char **mx_make_null_index(char **split, int index) {
      mx_strdel(&split[index]);
      split[index] = strdup("");
      for (int i = index - 1; split[i] && i > -1; i--)
          if (strcmp(split[i], "") != 0) {
              mx_strdel(&split[i]);
              split[i] = strdup("");
              break;
          }
      return split;
  }
  