added if statement to be able to convert negative integers

src/conversionOfNumbers/conversionOfNumbers.c

@@ -24,6 +24,10 @@ char* convertIntToBinaryStr(int input){
     int length = binaryStrLen(input);
     int rest;
     char* result = (char*)malloc(sizeof(char) * length + 1);
+    if(input < 0){
+        result[0] = '-';
+        input *= -1;
+    }
     result[length] = '\0';
     do{
         rest = input % 2;