diff --git a/functions.cpp b/functions.cpp
new file mode 100644
index 0000000..f65104a
--- /dev/null
+++ b/functions.cpp
@@ -0,0 +1,99 @@
+uint8_t utf8Ascii(uint8_t ascii) {
+  static uint8_t cPrev;
+  uint8_t c = '\0';
+
+  if (ascii < 0x7f)   // Standard ASCII-set 0..0x7F, no conversion
+  {
+    cPrev = '\0';
+    c = ascii;
+  }
+  else
+  {
+    switch (cPrev)  // Conversion depending on preceding UTF8-character
+    {
+    case 0xC2: c = ascii;  break;
+    case 0xC3: c = ascii | 0xC0;  break;
+    case 0x82: if (ascii==0xAC) c = 0x80; // Euro symbol special case
+    }
+    cPrev = ascii;   // save last char
+  }
+
+  return(c);
+}
+
+
+void utf8Ascii(char* s) {
+  uint8_t c, k = 0;
+  char *cp = s;
+
+  while (*s != '\0')
+  {
+    c = utf8Ascii(*s++);
+    if (c != '\0')
+      *cp++ = c;
+  }
+  *cp = '\0';   // terminate the new string
+}
+
+
+char* string2char(String command){
+    if(command.length()!=0){
+        char *p = const_cast<char*>(command.c_str());
+        return p;
+    }
+}
+
+
+// constant char* to char*
+char* cchar2char(String data){
+  char* out = new char[data.length()+1];
+  strcpy(out, data.c_str());
+  return out;
+}
+
+
+char * stringReplace(char *search, char *replace, char *string) {
+	char *tempString, *searchStart;
+	int len=0;
+
+	searchStart = strstr(string, search);
+	if(searchStart == NULL) {
+		return string;
+	}
+
+	tempString = (char*) malloc(strlen(string) * sizeof(char));
+	if(tempString == NULL) {
+		return NULL;
+	}
+
+	strcpy(tempString, string);
+
+	len = searchStart - string;
+	string[len] = '\0';
+
+	strcat(string, replace);
+
+	len += strlen(search);
+	strcat(string, (char*)tempString+len);
+
+	free(tempString);
+
+	return string;
+}
+
+
+String split(String s, char parser, int index) {
+  String rs="";
+  int parserIndex = index;
+  int parserCnt=0;
+  int rFromIndex=0, rToIndex=-1;
+  while (index >= parserCnt) {
+    rFromIndex = rToIndex+1;
+    rToIndex = s.indexOf(parser,rFromIndex);
+    if (index == parserCnt) {
+      //if (rToIndex < 0 || rToIndex < -1) return "";
+      return s.substring(rFromIndex,rToIndex);
+    } else parserCnt++;
+  }
+  return rs;
+}