diff --git a/include/huffman/huffman_tree.h b/include/huffman/huffman_tree.h
index d60bdc5..160cc4c 100644
--- a/include/huffman/huffman_tree.h
+++ b/include/huffman/huffman_tree.h
@@ -6,23 +6,31 @@
 #include <vector>
 #include <map>
 
+// struct HNode {
+//     uint8_t symbol;
+//     uint64_t freq;
+//     std::shared_ptr<HNode> left, right;
+//     bool isLeaf() const { return !left && !right; }
+// };
+
 struct HNode {
-    uint8_t symbol;
+    std::string symbol; 
     uint64_t freq;
     std::shared_ptr<HNode> left, right;
-    bool isLeaf() const { return !left && !right; }
+    //  só é "folha"  se tiver um símbolo && não tiver filhos.
+    bool isLeaf() const { return !symbol.empty() && !left && !right; } 
 };
 
 class HuffmanTree {
 public:
     HuffmanTree();
-    void build(const std::vector<uint64_t> &freqs); // freqs size 256
-    std::map<uint8_t, std::vector<bool>> getCodes() const;
+    void build(const std::map<std::string, uint64_t> &freqs); // freqs size 256
+    std::map<std::string, std::vector<bool>> getCodes() const;
     void serialize(std::ostream &out) const;
     void deserialize(std::istream &in);
 private:
     std::shared_ptr<HNode> root_;
-    void buildCodes(std::shared_ptr<HNode> node, std::vector<bool> &path, std::map<uint8_t, std::vector<bool>> &out) const;
+    void buildCodes(std::shared_ptr<HNode> node, std::vector<bool> &path, std::map<std::string, std::vector<bool>> &out) const;
 };
-
 #endif
+
diff --git a/src/freq_counter/main.cpp b/src/freq_counter/main.cpp
index c7d69c7..bca384c 100644
--- a/src/freq_counter/main.cpp
+++ b/src/freq_counter/main.cpp
@@ -5,28 +5,122 @@
 #include <string>
 #include <cstring>
 #include "../../include/huffman/huffman_tree.h"
+#include <set>
 
-// Simple freq_counter stub: count bytes and print summary
-int main(int argc, char** argv){
-    if(argc < 2){
-        std::cerr << "Usage: freq_counter <file> [-o out.txt]\n";
+
+//Function to help in case the loop find a char in the file
+std::string charToString(char c) {
+    return std::string(1, c);
+}
+
+int main(int argc, char** argv) {
+
+    if (argc < 2) {
+        std::cerr << "Usage: freq_counter <file1> [file2...] [-o out.freq]\n";
         return 1;
     }
-    std::vector<uint64_t> freqs(256,0);
-    for(int i=1;i<argc;i++){
-        std::string fname = argv[i];
-        if(fname == "-o"){ ++i; break; }
-        std::ifstream in(fname, std::ios::binary);
-        if(!in){ std::cerr << "Cannot open " << fname << "\n"; continue; }
+
+    std::map<std::string, uint64_t> freqs;
+    std::set<std::string> keyWords = {
+        "int", "double", "while", "return", "include", "new", "class", "public",
+        "private", "protected", "if", "else", "for", "switch", "case", "break",
+        "continue", "struct", "enum", "namespace", "using", "const", "char",
+        "void", "unsigned", "long", "short", "bool", "true", "false", "nullptr", "Node", "Interface"
+        //Adicioanr mais, tendo em vista que o professor pediu que seja compressor de várias linguagens
+    };
+
+    std::vector<std::string> inputFiles;
+    std::string outputFile = "";
+
+   
+    for (int i = 1; i < argc; ++i) {
+        std::string arg = argv[i];
+        if (arg == "-o") {
+
+            if (i + 1 < argc) {
+                outputFile = argv[i + 1];
+                i++;
+            } else {
+                std::cerr << "Erro: must have a file after -o \n";
+                return 1;
+            }
+        } 
+        else {
+            inputFiles.push_back(arg);
+        }
+    }
+
+    if (inputFiles.empty()) {
+        std::cerr << "Error: Input file not found \n";
+        return 1;
+    }
+
+    for (const std::string& fname : inputFiles) {
+        std::ifstream in(fname); 
+        if (!in) {
+            std::cerr << "Error: File didnt open" << fname << "\n";
+            continue;
+        }
         char c;
-        while(in.get(c)){
-            unsigned char uc = static_cast<unsigned char>(c);
-            freqs[uc]++;
+        
+        // O loop principal lê um caractere de cada vez
+        while (in.get(c)) {
+            
+            //3 condições diferentes, para identificar as possibilidades existentes de simbolos
+
+            // Identificar o inicio de alguma palavra reservada ou variável 
+            if (std::isalpha(c) || c == '_') {
+                std::string word;
+                word.push_back(c);
+
+                //in.peek() identifica o proximo char sem consumir
+                while (in.peek() != EOF && (std::isalnum(in.peek()) || in.peek() == '_')) {
+                    word.push_back(in.get());
+                }
+
+                if (keyWords.count(word)) {
+                
+                    freqs[word]++;
+                } else {
+
+                    for (char ch : word) {
+                        freqs[charToString(ch)]++;
+                    }
+                }
+            }
+
+            //Identificar o inicio de espaços, como \n, espaço em branco
+
+            else if (std::isspace(c)) {
+                freqs[charToString(c)]++;
+            }
+            else {              
+                freqs[charToString(c)]++;
+            }
         }
     }
-    // print non-zero frequencies
-    for(size_t i=0;i<freqs.size();++i){
-        if(freqs[i]) std::cout << i << " -> " << freqs[i] << "\n";
+
+    std::ostream* out_stream = &std::cout;
+    std::ofstream out_file;
+
+    if (!outputFile.empty()) {
+        out_file.open(outputFile);
+        if (!out_file) {
+            std::cerr << "Could not create output file" << outputFile << "\n";
+            return 1;
+        }
+        out_stream = &out_file;
+    }
+
+    // Formato do map simbolo:fequencia
+    for (const auto& pair : freqs) {
+        (*out_stream) << pair.first << ":" << pair.second << "\n";
     }
+
+    if (out_file.is_open()) {
+        out_file.close();
+        std::cout << "Frequency table saved in" << outputFile << "\n";
+    }
+
     return 0;
-}
+}
\ No newline at end of file