diff --git a/day1/day.cpp b/day1/day.cpp
index 48e2d11..5236de4 100644
--- a/day1/day.cpp
+++ b/day1/day.cpp
@@ -1,78 +1,61 @@
+#include "../include/useful_funcs.h"
 #include <algorithm>
-#include <iostream>
-#include <string>
-#include <vector>
+#include <errno.h>
+#include <fstream>
 #include <iostream>
 #include <sstream>
-#include <vector>
 #include <string>
-#include <fstream>
-#include <errno.h>
-
-std::vector<std::string> splitString(const std::string& str) {
-    std::istringstream iss(str);
-    std::vector<std::string> words;
-    std::string word;
-
-    while (iss >> word) {
-        words.push_back(word);
-    }
-
-    return words;
-}
+#include <vector>
 
 int main() {
-    std::ifstream inputfile("input");
-    std::string input;
-    
-    std::vector<int> l_sl;
-    std::vector<int> r_sl;
-    if (inputfile.is_open()) {
-        // Read each line from the file and store it in the
-        // 'line' variable.
-        std::string line;
-        std::vector<std::string> num_s;
-        while (std::getline(inputfile, line)) {
-            num_s = splitString(line);
-            l_sl.push_back(std::stoi(num_s[0]));
-            r_sl.push_back(std::stoi(num_s[1]));
-        }
+  std::ifstream inputfile("input");
+  std::string input;
 
-        // Close the file stream once all lines have been
-        // read.
-        inputfile.close();
+  std::vector<int> l_sl;
+  std::vector<int> r_sl;
+  if (inputfile.is_open()) {
+    // Read each line from the file and store it in the
+    // 'line' variable.
+    std::string line;
+    std::vector<std::string> num_s;
+    while (std::getline(inputfile, line)) {
+      num_s = splitString(line);
+      l_sl.push_back(std::stoi(num_s[0]));
+      r_sl.push_back(std::stoi(num_s[1]));
     }
-    else {
-        // Print an error message to the standard error
-        // stream if the file cannot be opened.
-        std::cerr << "Unable to open file!" << std::endl;
-        return ENOENT;
-    }
-    std::cout << "right: \n";
-    for (int i = 0; i< r_sl.size(); i++) {
-        std::cout << i << ": " << r_sl[i] << "\n";
-    }
-    int min_l;
-    int min_r;
-    int res = 0;
-    while (l_sl.size() != 0) {
-        min_l = l_sl[0];
-        for(int i = 0; i < l_sl.size(); i++) {
-            if(l_sl[i] < min_l) {
-                min_l = l_sl[i];
-            }
-        }
-        min_r = r_sl[0];
-        for(int i = 0; i < r_sl.size(); i++) {
-            if(r_sl[i] < min_r) {
-                min_r = r_sl[i];
-            }
-        }
-        l_sl.erase(find(l_sl.begin(), l_sl.end(), min_l));
-        r_sl.erase(find(r_sl.begin(), r_sl.end(), min_r));
-        res+= std::abs(min_l - min_r);
-    }
-    std::cout << "\n\n" << res << "\n\n";
-    
 
+    // Close the file stream once all lines have been
+    // read.
+    inputfile.close();
+  } else {
+    // Print an error message to the standard error
+    // stream if the file cannot be opened.
+    std::cerr << "Unable to open file!" << std::endl;
+    return ENOENT;
+  }
+  std::cout << "right: \n";
+  for (int i = 0; i < r_sl.size(); i++) {
+    std::cout << i << ": " << r_sl[i] << "\n";
+  }
+  int min_l;
+  int min_r;
+  int res = 0;
+  while (l_sl.size() != 0) {
+    min_l = l_sl[0];
+    for (int i = 0; i < l_sl.size(); i++) {
+      if (l_sl[i] < min_l) {
+        min_l = l_sl[i];
+      }
+    }
+    min_r = r_sl[0];
+    for (int i = 0; i < r_sl.size(); i++) {
+      if (r_sl[i] < min_r) {
+        min_r = r_sl[i];
+      }
+    }
+    l_sl.erase(find(l_sl.begin(), l_sl.end(), min_l));
+    r_sl.erase(find(r_sl.begin(), r_sl.end(), min_r));
+    res += std::abs(min_l - min_r);
+  }
+  std::cout << "\n\n" << res << "\n\n";
 }
\ No newline at end of file
diff --git a/day1/second.cpp b/day1/second.cpp
index 7f73994..c4674bc 100644
--- a/day1/second.cpp
+++ b/day1/second.cpp
@@ -1,66 +1,48 @@
+#include "../include/useful_funcs.h"
 #include <algorithm>
-#include <iostream>
-#include <string>
-#include <vector>
+#include <errno.h>
+#include <fstream>
 #include <iostream>
 #include <sstream>
-#include <vector>
 #include <string>
-#include <fstream>
-#include <errno.h>
-
-std::vector<std::string> splitString(const std::string& str) {
-    std::istringstream iss(str);
-    std::vector<std::string> words;
-    std::string word;
-
-    while (iss >> word) {
-        words.push_back(word);
-    }
-
-    return words;
-}
+#include <vector>
 
 int main() {
-    std::ifstream inputfile("input");
-    std::string input;
-    
-    std::vector<int> l_sl;
-    std::vector<int> r_sl;
-    if (inputfile.is_open()) {
-        // Read each line from the file and store it in the
-        // 'line' variable.
-        std::string line;
-        std::vector<std::string> num_s;
-        while (std::getline(inputfile, line)) {
-            num_s = splitString(line);
-            l_sl.push_back(std::stoi(num_s[0]));
-            r_sl.push_back(std::stoi(num_s[1]));
-        }
+  std::ifstream inputfile("input");
+  std::string input;
 
-        // Close the file stream once all lines have been
-        // read.
-        inputfile.close();
+  std::vector<int> l_sl;
+  std::vector<int> r_sl;
+  if (inputfile.is_open()) {
+    // Read each line from the file and store it in the
+    // 'line' variable.
+    std::string line;
+    std::vector<std::string> num_s;
+    while (std::getline(inputfile, line)) {
+      num_s = splitString(line);
+      l_sl.push_back(std::stoi(num_s[0]));
+      r_sl.push_back(std::stoi(num_s[1]));
     }
-    else {
-        // Print an error message to the standard error
-        // stream if the file cannot be opened.
-        std::cerr << "Unable to open file!" << std::endl;
-        return ENOENT;
-    }
-    std::cout << "right: \n";
-    for (int i = 0; i< r_sl.size(); i++) {
-        std::cout << i << ": " << r_sl[i] << "\n";
-    }
-    int min_l;
-    int min_r;
-    int res = 0;
-    for (int i = 0; i  < l_sl.size(); i++ ) {
-        
-        
-        res+= l_sl[i] * std::count(r_sl.begin(), r_sl.end(), l_sl[i]);
-    }
-    std::cout << "\n\n" << res << "\n\n";
-    
 
+    // Close the file stream once all lines have been
+    // read.
+    inputfile.close();
+  } else {
+    // Print an error message to the standard error
+    // stream if the file cannot be opened.
+    std::cerr << "Unable to open file!" << std::endl;
+    return ENOENT;
+  }
+  std::cout << "right: \n";
+  for (int i = 0; i < r_sl.size(); i++) {
+    std::cout << i << ": " << r_sl[i] << "\n";
+  }
+  int min_l;
+  int min_r;
+  int res = 0;
+  for (int i = 0; i < l_sl.size(); i++) {
+
+    res += l_sl[i] * std::count(r_sl.begin(), r_sl.end(), l_sl[i]);
+  }
+  std::cout << "\n\n" << res << "\n\n";
 }
\ No newline at end of file
diff --git a/day2/day.cpp b/day2/day.cpp
index 1e2fd0d..94213eb 100644
--- a/day2/day.cpp
+++ b/day2/day.cpp
@@ -1,3 +1,4 @@
+#include "../include/useful_funcs.h"
 #include <algorithm>
 #include <cstddef>
 #include <errno.h>
@@ -7,18 +8,6 @@
 #include <string>
 #include <vector>
 
-std::vector<std::string> splitString(const std::string &str) {
-  std::istringstream iss(str);
-  std::vector<std::string> words;
-  std::string word;
-
-  while (iss >> word) {
-    words.push_back(word);
-  }
-
-  return words;
-}
-
 int main() {
   std::ifstream inputfile("input");
   std::string input;
@@ -33,9 +22,7 @@ int main() {
       num_s = splitString(line);
       num.clear();
 
-      // Convert strings to integers
-      std::transform(num_s.begin(), num_s.end(), std::back_inserter(num),
-                     [](const std::string &s) { return std::stoi(s); });
+      CastStringVectorToIntVector(num_s, num);
 
       // decreasing
       bool safe = true;
diff --git a/day2/second.cpp b/day2/second.cpp
index 8659665..d5483f9 100644
--- a/day2/second.cpp
+++ b/day2/second.cpp
@@ -1,3 +1,4 @@
+#include "../include/useful_funcs.h"
 #include <algorithm>
 #include <cstddef>
 #include <errno.h>
@@ -7,18 +8,6 @@
 #include <string>
 #include <vector>
 
-std::vector<std::string> splitString(const std::string &str) {
-  std::istringstream iss(str);
-  std::vector<std::string> words;
-  std::string word;
-
-  while (iss >> word) {
-    words.push_back(word);
-  }
-
-  return words;
-}
-
 bool isSafe(const std::vector<int> &num, bool checkIncreasing) {
   for (size_t i = 1; i < num.size(); ++i) {
     int diff = checkIncreasing ? (num[i] - num[i - 1]) : (num[i - 1] - num[i]);
@@ -61,9 +50,7 @@ int main() {
       num_s = splitString(line);
       num.clear();
 
-      // Convert strings to integers
-      std::transform(num_s.begin(), num_s.end(), std::back_inserter(num),
-                     [](const std::string &s) { return std::stoi(s); });
+      CastStringVectorToIntVector(num_s, num);
 
       // Check safety with Problem Dampener support
       if (isSafeWithDampener(num)) {
diff --git a/day4/day.cpp b/day4/day.cpp
index 578ec7d..746a924 100644
--- a/day4/day.cpp
+++ b/day4/day.cpp
@@ -1,4 +1,5 @@
 
+#include "../include/useful_funcs.h"
 #include <asm-generic/errno.h>
 #include <cstdlib>
 #include <errno.h>
@@ -6,27 +7,6 @@
 #include <iostream>
 #include <vector>
 
-bool AreWeInBounds(int i, int j, std::vector<std::vector<char>> &wordsearch) {
-  if (i < 0 || j < 0) {
-    return false;
-  }
-  if (i >= wordsearch.size() || j >= wordsearch[i].size()) {
-    return false;
-  }
-  return true;
-}
-
-int conditional_operation(int a, int b, char op) {
-  switch (op) {
-  case '+':
-    return a + b;
-  case '-':
-    return a - b;
-  default:
-    return a;
-  }
-}
-
 int Check(std::vector<std::vector<char>> &wordsearch, int i, int j) {
   int xmases = 0;
   char op_i;
diff --git a/day4/second.cpp b/day4/second.cpp
index e6d1758..70d19e8 100644
--- a/day4/second.cpp
+++ b/day4/second.cpp
@@ -1,36 +1,15 @@
 
+#include "../include/useful_funcs.h"
 #include <asm-generic/errno.h>
 #include <cstdlib>
 #include <errno.h>
 #include <fstream>
 #include <iostream>
 #include <vector>
-
 #define RANGE 1
 
 int res;
 
-bool AreWeInBounds(int i, int j, std::vector<std::vector<char>> &wordsearch) {
-  if (i < 0 || j < 0) {
-    return false;
-  }
-  if (i >= wordsearch.size() || j >= wordsearch[i].size()) {
-    return false;
-  }
-  return true;
-}
-
-int conditional_operation(int a, int b, char op) {
-  switch (op) {
-  case '+':
-    return a + b;
-  case '-':
-    return a - b;
-  default:
-    return a;
-  }
-}
-
 int Check(std::vector<std::vector<char>> &wordsearch, int i, int j) {
   int xmases = 0;
   char op_i;
diff --git a/day5/day.cpp b/day5/day.cpp
index 53e71b7..d13f2d8 100644
--- a/day5/day.cpp
+++ b/day5/day.cpp
@@ -1,3 +1,4 @@
+#include "../include/useful_funcs.h"
 #include <algorithm>
 #include <array>
 #include <codecvt>
@@ -8,24 +9,6 @@
 #include <string>
 #include <vector>
 
-std::vector<std::string> splitString(const std::string &str) {
-  std::vector<std::string> words;
-  std::string word;
-  std::istringstream iss(str);
-
-  // Use std::getline with ',' as the delimiter
-  while (std::getline(iss, word, ',')) {
-    // Trim whitespace from the beginning and end of the word
-    size_t start = word.find_first_not_of(" \t");
-    size_t end = word.find_last_not_of(" \t");
-    if (start != std::string::npos && end != std::string::npos) {
-      words.push_back(word.substr(start, end - start + 1));
-    }
-  }
-
-  return words;
-}
-
 void MoveElementByIndex(std::vector<int> &vec, int index, int newIndex) {
   if (index == newIndex) {
     return;
@@ -64,11 +47,9 @@ int main() {
       sscanf(line.c_str(), "%d|%d", &RuleTmp[0], &RuleTmp[1]);
       rules.push_back(RuleTmp);
     } else {
-      lineSplited = splitString(line);
-      // transform strings to ints
-      std::transform(lineSplited.begin(), lineSplited.end(),
-                     std::back_inserter(lineSplitedInt),
-                     [](const std::string &s) { return std::stoi(s); });
+      lineSplited = splitStringByChar(line, ',');
+
+      CastStringVectorToIntVector(lineSplited, lineSplitedInt);
 
       for (int i = 0; i < rules.size(); i++) {
         for (int j = 0; j < lineSplitedInt.size(); j++) {
diff --git a/day5/second.cpp b/day5/second.cpp
index 79d9b5f..6b99fe1 100644
--- a/day5/second.cpp
+++ b/day5/second.cpp
@@ -1,3 +1,4 @@
+#include "../include/useful_funcs.h"
 #include <algorithm>
 #include <array>
 #include <codecvt>
@@ -8,24 +9,6 @@
 #include <string>
 #include <vector>
 
-std::vector<std::string> splitString(const std::string &str) {
-  std::vector<std::string> words;
-  std::string word;
-  std::istringstream iss(str);
-
-  // Use std::getline with ',' as the delimiter
-  while (std::getline(iss, word, ',')) {
-    // Trim whitespace from the beginning and end of the word
-    size_t start = word.find_first_not_of(" \t");
-    size_t end = word.find_last_not_of(" \t");
-    if (start != std::string::npos && end != std::string::npos) {
-      words.push_back(word.substr(start, end - start + 1));
-    }
-  }
-
-  return words;
-}
-
 void MoveElementByIndex(std::vector<int> &vec, int index, int newIndex) {
   if (index == newIndex) {
     return;
@@ -65,10 +48,8 @@ int main() {
       rules.push_back(RuleTmp);
     } else {
       lineSplited = splitString(line);
-      // transform strings to ints
-      std::transform(lineSplited.begin(), lineSplited.end(),
-                     std::back_inserter(lineSplitedInt),
-                     [](const std::string &s) { return std::stoi(s); });
+
+      CastStringVectorToIntVector(lineSplited, lineSplitedInt);
 
       for (int i = 0; i < rules.size(); i++) {
         for (int j = 0; j < lineSplitedInt.size(); j++) {
diff --git a/day6/day.cpp b/day6/day.cpp
index 3f6c2be..a300061 100644
--- a/day6/day.cpp
+++ b/day6/day.cpp
@@ -1,28 +1,8 @@
+#include "../include/useful_funcs.h"
 #include <fstream>
 #include <iostream>
 #include <vector>
 
-bool AreWeInBounds(int x, int y, std::vector<std::vector<char>> &map) {
-  if (x < 0 || y < 0) {
-    return false;
-  }
-  if (x >= map.size() || y >= map[x].size()) {
-    return false;
-  }
-  return true;
-}
-
-int conditional_operation(int a, int b, char op) {
-  switch (op) {
-  case '+':
-    return a + b;
-  case '-':
-    return a - b;
-  default:
-    return a;
-  }
-}
-
 int main() {
   std::ifstream inputfile("input");
   std::string input;
diff --git a/day6/second.cpp b/day6/second.cpp
index 7b0e8aa..84ef77d 100644
--- a/day6/second.cpp
+++ b/day6/second.cpp
@@ -1,29 +1,9 @@
+#include "../include/useful_funcs.h"
 #include <fstream>
 #include <iostream>
 #include <ostream>
 #include <vector>
 
-bool AreWeInBounds(int x, int y, std::vector<std::vector<char>> &map) {
-  if (x < 0 || y < 0) {
-    return false;
-  }
-  if (x >= map.size() || y >= map[x].size()) {
-    return false;
-  }
-  return true;
-}
-
-int conditional_operation(int a, int b, char op) {
-  switch (op) {
-  case '+':
-    return a + b;
-  case '-':
-    return a - b;
-  default:
-    return a;
-  }
-}
-
 bool WillHeGetStuck(int posX, int posY, int direction, int locX, int locY,
                     std::vector<std::vector<char>> map) {
   char op_x;
diff --git a/day7/day.cpp b/day7/day.cpp
new file mode 100644
index 0000000..aa13456
--- /dev/null
+++ b/day7/day.cpp
@@ -0,0 +1,37 @@
+#include <cstdio>
+#include <fstream>
+#include <iostream>
+#include <sstream>
+#include <vector>
+
+std::vector<std::string> splitString(const std::string &str) {
+  std::istringstream iss(str);
+  std::vector<std::string> words;
+  std::string word;
+
+  while (iss >> word) {
+    words.push_back(word);
+  }
+
+  return words;
+}
+
+int main() {
+  std::ifstream inputfile("input");
+  std::string input;
+
+  int res = 0;
+  if (!inputfile.is_open()) {
+    std::cerr << "Could not open the file" << std::endl;
+    return ENOENT;
+  }
+  std::string line;
+  std::vector<std::string> lineSplited;
+  int EqRes;
+
+  while (std::getline(inputfile, line)) {
+    lineSplited = splitString(line);
+    sscanf(lineSplited[0].c_str(), "%d:", &EqRes);
+    lineSplited.erase(lineSplited.begin());
+  }
+}
\ No newline at end of file
diff --git a/include/useful_funcs.h b/include/useful_funcs.h
new file mode 100644
index 0000000..f192cce
--- /dev/null
+++ b/include/useful_funcs.h
@@ -0,0 +1,62 @@
+#include <algorithm>
+#include <sstream>
+#include <vector>
+
+inline std::vector<std::string> splitString(const std::string &str) {
+  std::istringstream iss(str);
+  std::vector<std::string> words;
+  std::string word;
+
+  while (iss >> word) {
+    words.push_back(word);
+  }
+
+  return words;
+}
+
+inline void CastStringVectorToIntVector(const std::vector<std::string> &strVec,
+                                        std::vector<int> &intVec) {
+  std::transform(strVec.begin(), strVec.end(), std::back_inserter(intVec),
+                 [](const std::string &s) { return std::stoi(s); });
+}
+
+inline bool AreWeInBounds(int x, int y,
+                          std::vector<std::vector<char>> &TwoDCharVec) {
+  if (x < 0 || y < 0) {
+    return false;
+  }
+  if (x >= TwoDCharVec.size() || y >= TwoDCharVec[x].size()) {
+    return false;
+  }
+  return true;
+}
+
+inline int conditional_operation(int a, int b, char op) {
+  switch (op) {
+  case '+':
+    return a + b;
+  case '-':
+    return a - b;
+  default:
+    return a;
+  }
+}
+
+inline std::vector<std::string> splitStringByChar(const std::string &str,
+                                                  char c) {
+  std::vector<std::string> words;
+  std::string word;
+  std::istringstream iss(str);
+
+  // Use std::getline with ',' as the delimiter
+  while (std::getline(iss, word, c)) {
+    // Trim whitespace from the beginning and end of the word
+    size_t start = word.find_first_not_of(" \t");
+    size_t end = word.find_last_not_of(" \t");
+    if (start != std::string::npos && end != std::string::npos) {
+      words.push_back(word.substr(start, end - start + 1));
+    }
+  }
+
+  return words;
+}