Arduino error : invalid conversion from 'const char*' to 'char*' [-fpermissive]

I am trying to remove utf-8 characters from json data but i get error shown below ;

invalid conversion from 'const char*' to 'char*' [-fpermissive]

and to get json data I am using the code below ;

memset(json,0,sizeof(json));
msg.toCharArray(json, 400);
deserializeJson(doc, json);
JsonObject LEAVE = doc["DATA"][0];
const char* NAME = LEAVE["NAME"];
diacriticalStripper (NAME, strlen(NAME));  ///this is where I get error

to remove utf-8 data from json string I am using code below ;

void diacriticalStripper (char Text[], int TextLength) {
  int i = 0;
  do {
    char c = Text[i];
    if ((uint8_t)c == 195) { // diacritical code?      
      char c2 = Text[i + 1]; // yes, convert next character
      switch ((uint8_t)c2) {
        case 160 ... 166:
         Text[i] = 'a';
          break;
        case 167:
          Text[i] = 'c';
          break;
        case 168 ... 171:
          Text[i] = 'e';
          break;
        case 172 ... 175:
          Text[i] = 'i';
          break;
        case 177:
          Text[i] = 'n';
          break;
        case 178 ... 182:
          Text[i] = 'o';
          break;
        case 185 ... 188:
          Text[i] = 'u';
          break;
        case 189 ... 191:
          Text[i] = 'y';
          break;
        case 128 ... 134:
          Text[i] = 'A';
          break;
        case 135:
          Text[i] = 'C';
          break;
        case 136 ... 139:
          Text[i] = 'E';
          break;
        case 140 ... 143:
          Text[i] = 'I';
          break;
        case 146 ... 150:
          Text[i] = 'O';
          break;
        case 153 ... 156:
          Text[i] = 'U';
          break;
        default:
          break;
      }
      for (int j = i + 1; j < TextLength; j++) Text[j] = Text[j + 1];
      TextLength --;
    }
    i++;
  } while (i < TextLength);
}

I tried some other convertions but all gave error...

Thanks in advance