// =======================================================================
#define MAKEDONIZACIJA
void utf8ascii (const char* input, char* output){ 
  // =======================================================================
  // OPTIMIZOVANA VERZIJA 2: KOD ZA MEŠOVITA SLOVA (BRZA MATEMATIKA)
  // =======================================================================
  const char C1[] PROGMEM = "CueaaaaceeeiiiAAEaAooouuyOUcPYPfaiounNao?<>//!<>";
  const char C3[] PROGMEM = "AAAAAAACEEEEIIIIDNOOOOOx0UUUUYTsaaaaaaaceeeeiiiidnooooo/ouuuuyty";
  const char C4[] PROGMEM = "AaAaAaCcCcCcCcDdDdEeEeEeEeEeGgGgGgGgHhHhIiIiIiIiIiIiJjKkkLlLlLlL";
  const char C5[] PROGMEM = "lLlNnNnNnnNnOoOoOoOoRrRrRrSsSsSsSsTtTtTtUuUuUuUuUuUuWwYyYZzZzZzs";
  const char CE[] PROGMEM = "????''A'EII?O?YOiAVGDEZITIKLMNXOPR?STYFHPOIYaeiiuavgdezitiklmnxo";
  const char CF[] PROGMEM = "prsstyfhpoiyoyoK";
  #ifdef MAKEDONIZACIJA
  const char D0[] PROGMEM = "EJDGJDIJJLNCKIUDABVGDEZZIJKLMNOPRSTUFHCCSSYIJEJJabvgdezzijklmnop";
  const char D1[] PROGMEM = "rstufhccssyijejjejdgjdijjlnckiud";
  #define slovo_j 'j'
  #define slovo_J 'J'
  #else
  const char D0[] PROGMEM = "EYDGYSIYJLNCKIUDABVGDEZZIYKLMNOPRSTUFHCCSSWIYEYYabvgdezziyklmnop";
  const char D1[] PROGMEM = "rstufhccsswiyeyyeydgydiyjlnckiud";
  #define slovo_j 'y'
  #define slovo_J 'Y'
  #endif

  unsigned char c,l;
  unsigned char  up_c=0, up_l=0;
  char case_offset = 0; 
  bool all_caps = true; 
  bool bug_jat = false; 
  bool l_uc,l_lc,c_uc,c_lc;
  int j=0; int i=0,
  last_l=0, last_j=0,
  curr_l=0, curr_j=0,
  first_l=0, first_j=0;
  for (; input[i]!='\0'; i++) { 
    unsigned char a = (unsigned char)input[i]; 
    if (all_caps && a>='a' && a<='z') all_caps=false;
    if (a <= 0x7F) output[j++] = a; 
    else if (a < 0xB0) output[j++] = C1[a-128];
    else if (a == 0xC2) {
      if (i > 1 && input[i-1] == 0x83)
        switch ((unsigned char)input[++i]){
          case 0x89: output[j-1] = 'E'; break; // Mojibake É
          case 0x81: output[j-1] = 'A'; break; // Mojibake Á
          case 0x96: output[j-1] = 'O'; break; // Mojibake Ö
          case 0x9C: output[j-1] = 'U'; break; // Mojibake Ü
          case 0xA0: output[j-1] = 'a'; break; // Mojibake à 
          case 0xA1: output[j-1] = 'a'; break; // Mojibake á 
          case 0xA2: output[j-1] = 'a'; break; // Mojibake â 
          case 0xA7: output[j-1] = 'c'; break; // Mojibake ç  
          case 0xA6: output[j-1] = 'c'; break; // Popravlja Ň -> ć/c
          case 0xA8: output[j-1] = 'e'; break; // Mojibake è 
          case 0xA9: output[j-1] = 'e'; break; // Mojibake é 
          case 0xAD: output[j-1] = 'i'; break; // Mojibake í 
          case 0xB1: output[j-1] = 'n'; break; // Mojibake ñ
          case 0xB3: output[j-1] = 'o'; break; // Mojibake à 
          case 0xBC: output[j-1] = 'u'; break; // Mojibake à 
          case 0xAB: output[j-1] = 'e'; break; // Popravlja Noël (Noal -> Noel)
          case 0xB8: output[j-1] = 'o'; break; // Popravlja Jørgen i Søren (Jargen/Saren -> Jorgen/Soren)
          case 0xB6: output[j-1] = 'o'; break; // Popravlja Nyögő (Nyaga -> Nyogo)
        }
      else if (i > 1 && input[i-1] == 0x84)
        switch ((unsigned char)input[++i]){
          case 0xA0: output[j-1] = 'c'; break; // Popravlja Ň -> ć/c
          case 0x8C: output[j-1] = 'c'; break; // Popravlja ÅŒ -> č/c
      }else if (i > 1 && input[i-1] == 0x85)
        switch ((unsigned char)input[++i]){
          case 0xA1: output[j-1] = 's'; break; // Popravlja Å¡ -> š/s
          case 0xBE: output[j-1] = 'z'; break; // Popravlja ž -> ž/z
          case 0xA0: output[j-1] = 'S'; break; // Popravlja Å  -> Š/S
          case 0xBD: output[j-1] = 'Z'; break; // Popravlja Ž -> Ž/Z
          case 0x94: output[j-1] = 'D'; break;
        }
      else if (i > 3 && input[i-4] == 0xA2)
        switch ((unsigned char)input[++i]){
          case 0xAC: output[--j-1] = 'e'; break; // Popravlja € -> e
        }
      else
        switch ((unsigned char)input[++i]){ 
          case 0x80: output[j++] = 'e'; break; // €
          case 0x8A: output[j++] = 'S'; break; // Š
          case 0x8C: output[j++] = 'O'; output[j++] = 'e'; break; // Π
          case 0x8E: output[j++] = 'z'; break; // Ž
          case 0x99: output[j++] = '['; output[j++] = 'T'; output[j++] = 'M'; output[j++] = ']'; break; // ™
          case 0x9A: output[j++] = 's'; break; // š
          case 0x9C: output[j++] = 'O'; output[j++] = 'e'; break; // œ 
          case 0xA2: output[j++] = 'c'; break; // ¢
          case 0x9F: case 0xA5: output[j++] = 'Y'; break; // Ÿ,¥ 
          case 0xA0: output[j++] = ' '; break; // No-break Space
          case 0xA9: if (input[i-2]==0x82) j--;
            output[j++] = '('; output[j++] = 'C'; output[j++] = ')'; break; // ©
          case 0xAE: if (input[i-2]==0x82) j--;
            output[j++] = '('; output[j++] = 'R'; output[j++] = ')'; break; // ® 
        } 
    } else if (a == 0xE2) 
      if (i > 1 && input[i-1] == 0x84)
        switch ((unsigned char)input[++i]){
          case 0x80: 
            switch ((unsigned char)input[++i]){
              case 0x98: output[j-1] = 'd'; output[j++] = 'j';break; // Popravlja Å• -> đ/d (Malo)
            } break;
        }
    else { 
      unsigned char u = (unsigned char)input[++i]; 
      curr_j = j; 
      if (j>0) up_l = output[j-1] & 0b11011111;
      switch (a) { 
        case 0xC3: 
          c = C3[u-128]; 
          output[j++] = c; 
          if (u == 0x86 || u == 0xA6) 
            output[j++] = 'e'-case_offset; // Æ,æ Letter AE
          else if (u == 0x9E || u == 0xBE) 
            output[j++] = 'h'-case_offset; // Þ,þ Letter Thorn
          break; 
        case 0xC4: 
          c = C4[u-128]; 
          output[j++] = c; 
          if (u == 0x90 || u == 0x91 || u == 0xB2 || u == 0xB3) 
            output[j++] = 'j'-case_offset; // Đ,đ,IJ,ij - Dj,dj,Ij,ij // Letters D With Stroke & Ligature Ij
          break; 
        case 0xC5:
          c = C5[u-128]; 
          output[j++] = c; 
          if (u == 0x98 || u == 0x99) 
            output[j++] = 'z'-case_offset; // Ř,ř - Rz,rz
          else if (u == 0x92 || u == 0x93) 
            output[j++] = 'e'-case_offset; // Œ,œ - Oe,oe // Ligature Oe
          break; 
        case 0xCE: 
          c = CE[u-128]; 
          up_c = c & 0b11011111;
          if ((up_l=='M') && (up_c=='P')) output[j-1] = 'B'+output[j-1]-up_l;
          else if ((up_l=='N') && (up_c=='T')) output[j-1] = 'D'+output[j-1]-up_l;
          else{
            output[j++] = c; 
            if (u == 0x98 || u == 0xB8) output[j++] = 'h'; // Θ,θ - Th,th // Letter Theta
            else if (u == 0xA8) output[j++] = 's'; // Ψ - Ps,ps // Capital Letter Psi
          }
          break;
        case 0xCF: 
          c = CF[u-128]; 
          up_c = c & 0b11011111;
          if (u < 0x90) {
            if ((up_l=='M') && (up_c=='P')) output[j-1] = 'B'+output[j-1]-up_l;
            else if ((up_l=='N') && (up_c=='T')) output[j-1] = 'D'+output[j-1]-up_l;
            else{
              output[j++] = c; 
              if (u == 0x88) output[j++] = 's'; // ψ - ps // Small Letter Psi
            }
          }
          break;
        case 0xD0: 
          c = D0[u-128]; 
          up_c = c & 0b11011111;
          if (bug_jat){
            if (up_c==slovo_J)  j--; 
            else if (up_c=='A' || up_c=='E' || up_c=='I' || up_c=='O' || up_c=='U') output[j-1] = slovo_j;
          } bug_jat=false; 
          if ((up_l=='E' || up_l=='I' || up_l=='A'/* || up_l=='O' || up_l=='U'*/) && (up_c=='E' || up_c=='I')) 
            output[j++] = slovo_j;
          if (u != 0xAC || up_l == 'L' || up_l == 'N') output[j++] = c; //not a ь - Soft Sign
          switch (u){
            case 0xAA: bug_jat=true; break;                  // Ъ - Hard Sign
            case 0x81: output[j++] = 'o'; break; // Ё - Yo
            case 0x84: output[j++] = 'e'; break; // Є - Ye //Ukrainian Ie 
            case 0x85: output[j++] = 'z'; break; // Ѕ - Dz //Macedonian Dze 
            case 0x87: output[j++] = 'i'; break; // Ї - Yi //Ukrainian Yi
            case 0x8F: output[j++] = 'z';        
              output[j++] = 'h'; break;          // Џ - Dz //Serbian Letter Dzhe
            case 0xAE: output[j++] = 'u'; break; // Ю - Yu
            case 0xAF: output[j++] = 'a'; break; // Я - Ya
            case 0xA9: output[j++] = 'c';        // Щ - Sch
            case 0x96: case 0xA7: case 0xA8: case 0xB6:            
              output[j++] = 'h'; break;          // Ж,Ч,Ш,ж - Zh,Ch,Sh,zh
            case 0x82: case 0x83: case 0x89: case 0x8A: case 0x8C: 
              output[j++] = 'j'; break;          // Ђ,Ѓ,Љ,Њ,Ќ - Dj,Gj,Lj,Nj,Kj // SR & MK Letters
          } break; 
        case 0xD1: 
          c = D1[u-128]; 
          up_c = c & 0b11011111;
          if (u < 0xA0) {
            if (bug_jat){
              if (up_c==slovo_J)  j--; 
              else if (up_c=='A' || up_c=='E' || up_c=='I' || up_c=='O' || up_c=='U') output[j-1] = slovo_j;
            } bug_jat=false; 
            if ((up_l=='E' || up_l=='I' || up_l=='A'/* || up_l=='O' || up_l=='U'*/) && (up_c=='E' || up_c=='I')) 
              output[j++] = slovo_j;
            if (u != 0x8C || up_l == 'L' || up_l == 'N') output[j++] = c; //not a ь - Soft Sign
          }switch (u){ 
            case 0x8A: bug_jat=true; break;                  // ъ - Hard Sign
            case 0x8E: output[j++] = 'u'; break; // ю - yu
            case 0x8F: output[j++] = 'a'; break; // я - ya
            case 0x91: output[j++] = 'o'; break; // ё - yo
            case 0x94: output[j++] = 'e'; break; // є - ye
            case 0x95: output[j++] = 'z'; break; // ѕ - dz 
            case 0x97: output[j++] = 'i'; break; // ї - yi
            case 0x9F: output[j++] = 'z'; 
              output[j++] = 'h'; break;          // џ - dz //Serbian Letter Dzhe 
            case 0x89: output[j++] = 'c';        // щ - sch
            case 0x87: case 0x9B: case 0x88:                       
              output[j++] = 'h'; break;          // ч,ћ,ш - ch,ch,sh    
            case 0x92: case 0x93: case 0x99: case 0x9A: case 0x9C: 
              output[j++] = 'j'; break;          // ђ,ѓ,љ,њ,ќ //dj,gj,lj,nj,kj // SR & MK Letters
          } break;
      }
      if (all_caps && curr_j>0 && c>='a' && c<='z') all_caps=false;
    }
  }
  if (all_caps) for(int k=0; k<j; k++) if (output[k]>='a' && output[k]<='z')output[k]&=0b1011111; 
  output[j] = '\0';
}

static char input[256],output[256];

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}

void loop() {
  if (Serial.available()) {
      int len = Serial.readBytesUntil('\n', (char*) input, sizeof(input)-1);
      input[len] = '\0';
      
      // Uklanjanje \r ako postoji
      if (len > 0 && input[len-1] == '\r') {
          input[len-1] = '\0';
      }

      utf8ascii(input, output);
      //Serial.println();
      //Serial.println(input);
      //Serial.println();
      Serial.println(output);
  }
  delay(10);
}